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Integral of sqrt(y^2-x^2) dx

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 sin(x)               
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$$\int\limits_{0}^{\sin{\left(x \right)}} \sqrt{- x^{2} + y^{2}}\, dx$$
Integral(sqrt(y^2 - x^2), (x, 0, sin(x)))
The answer (Indefinite) [src]
                         //     2      /x\                                                        \
                         ||  I*y *acosh|-|              3                                 | 2|    |
                         ||            \y/           I*x                 I*x*y            |x |    |
                         ||- ------------- + ------------------- - -----------------  for |--| > 1|
                         ||        2                   _________           _________      | 2|    |
  /                      ||                           /       2           /       2       |y |    |
 |                       ||                          /       x           /       x                |
 |    _________          ||                  2*y*   /   -1 + --    2*   /   -1 + --               |
 |   /  2    2           ||                        /          2        /          2               |
 | \/  y  - x   dx = C + |<                      \/          y       \/          y                |
 |                       ||                                                                       |
/                        ||                                    ________                           |
                         ||                                   /      2                            |
                         ||                                  /      x                             |
                         ||              2     /x\   x*y*   /   1 - --                            |
                         ||             y *asin|-|         /         2                            |
                         ||                    \y/       \/         y                             |
                         ||             ---------- + ------------------                otherwise  |
                         \\                 2                2                                    /
$$\int \sqrt{- x^{2} + y^{2}}\, dx = C + \begin{cases} \frac{i x^{3}}{2 y \sqrt{\frac{x^{2}}{y^{2}} - 1}} - \frac{i x y}{2 \sqrt{\frac{x^{2}}{y^{2}} - 1}} - \frac{i y^{2} \operatorname{acosh}{\left(\frac{x}{y} \right)}}{2} & \text{for}\: \left|{\frac{x^{2}}{y^{2}}}\right| > 1 \\\frac{x y \sqrt{- \frac{x^{2}}{y^{2}} + 1}}{2} + \frac{y^{2} \operatorname{asin}{\left(\frac{x}{y} \right)}}{2} & \text{otherwise} \end{cases}$$
The answer [src]
/     0                                                                                                                  
|     /                                                                                                                  
|    |                                                                                                                   
|    |   /                             2                   4                     2            | 2|                       
|    |   |        I*y               I*x                 I*x                 3*I*x             |x |                       
|    |   |- --------------- + ---------------- - ----------------- + -------------------  for |--| > 1                   
|    |   |        _________                3/2                 3/2             _________      | 2|                       
|    |   |       /       2        /      2\           /      2\               /       2       |y |                       
|    |   |      /       x         |     x |         3 |     x |              /       x                                   
|    |   |     /   -1 + --    2*y*|-1 + --|      2*y *|-1 + --|      2*y*   /   -1 + --                                  
|    |   |    /          2        |      2|           |      2|            /          2                                  
|    |   |  \/          y         \     y /           \     y /          \/          y                                   
|    |   |                                                                                                               
|    |   |                   ________                                                                                    
|-   |   <                  /      2                                                                   dx  for sin(x) < 0
|    |   |                 /      x                                                                                      
|    |   |           y*   /   1 - --                                                                                     
|    |   |               /         2                                2                                                    
|    |   |             \/         y            y                   x                                                     
|    |   |           ---------------- + ---------------- - ------------------              otherwise                     
|    |   |                  2                   ________             ________                                            
|    |   |                                     /      2             /      2                                             
|    |   |                                    /      x             /      x                                              
|    |   |                              2*   /   1 - --    2*y*   /   1 - --                                             
|    |   |                                  /         2          /         2                                             
|    |   \                                \/         y         \/         y                                              
|    |                                                                                                                   
|   /                                                                                                                    
| sin(x)                                                                                                                 
<                                                                                                                        
| sin(x)                                                                                                                 
|    /                                                                                                                   
|   |                                                                                                                    
|   |   /                             2                   4                     2            | 2|                        
|   |   |        I*y               I*x                 I*x                 3*I*x             |x |                        
|   |   |- --------------- + ---------------- - ----------------- + -------------------  for |--| > 1                    
|   |   |        _________                3/2                 3/2             _________      | 2|                        
|   |   |       /       2        /      2\           /      2\               /       2       |y |                        
|   |   |      /       x         |     x |         3 |     x |              /       x                                    
|   |   |     /   -1 + --    2*y*|-1 + --|      2*y *|-1 + --|      2*y*   /   -1 + --                                   
|   |   |    /          2        |      2|           |      2|            /          2                                   
|   |   |  \/          y         \     y /           \     y /          \/          y                                    
|   |   |                                                                                                                
|   |   |                   ________                                                                                     
|   |   <                  /      2                                                                   dx     otherwise   
|   |   |                 /      x                                                                                       
|   |   |           y*   /   1 - --                                                                                      
|   |   |               /         2                                2                                                     
|   |   |             \/         y            y                   x                                                      
|   |   |           ---------------- + ---------------- - ------------------              otherwise                      
|   |   |                  2                   ________             ________                                             
|   |   |                                     /      2             /      2                                              
|   |   |                                    /      x             /      x                                               
|   |   |                              2*   /   1 - --    2*y*   /   1 - --                                              
|   |   |                                  /         2          /         2                                              
|   |   \                                \/         y         \/         y                                               
|   |                                                                                                                    
|  /                                                                                                                     
\  0                                                                                                                     
$$\begin{cases} - \int\limits_{\sin{\left(x \right)}}^{0} \begin{cases} - \frac{i x^{4}}{2 y^{3} \left(\frac{x^{2}}{y^{2}} - 1\right)^{\frac{3}{2}}} + \frac{3 i x^{2}}{2 y \sqrt{\frac{x^{2}}{y^{2}} - 1}} + \frac{i x^{2}}{2 y \left(\frac{x^{2}}{y^{2}} - 1\right)^{\frac{3}{2}}} - \frac{i y}{\sqrt{\frac{x^{2}}{y^{2}} - 1}} & \text{for}\: \left|{\frac{x^{2}}{y^{2}}}\right| > 1 \\- \frac{x^{2}}{2 y \sqrt{- \frac{x^{2}}{y^{2}} + 1}} + \frac{y \sqrt{- \frac{x^{2}}{y^{2}} + 1}}{2} + \frac{y}{2 \sqrt{- \frac{x^{2}}{y^{2}} + 1}} & \text{otherwise} \end{cases}\, dx & \text{for}\: \sin{\left(x \right)} < 0 \\\int\limits_{0}^{\sin{\left(x \right)}} \begin{cases} - \frac{i x^{4}}{2 y^{3} \left(\frac{x^{2}}{y^{2}} - 1\right)^{\frac{3}{2}}} + \frac{3 i x^{2}}{2 y \sqrt{\frac{x^{2}}{y^{2}} - 1}} + \frac{i x^{2}}{2 y \left(\frac{x^{2}}{y^{2}} - 1\right)^{\frac{3}{2}}} - \frac{i y}{\sqrt{\frac{x^{2}}{y^{2}} - 1}} & \text{for}\: \left|{\frac{x^{2}}{y^{2}}}\right| > 1 \\- \frac{x^{2}}{2 y \sqrt{- \frac{x^{2}}{y^{2}} + 1}} + \frac{y \sqrt{- \frac{x^{2}}{y^{2}} + 1}}{2} + \frac{y}{2 \sqrt{- \frac{x^{2}}{y^{2}} + 1}} & \text{otherwise} \end{cases}\, dx & \text{otherwise} \end{cases}$$
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/     0                                                                                                                  
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|    |                                                                                                                   
|    |   /                             2                   4                     2            | 2|                       
|    |   |        I*y               I*x                 I*x                 3*I*x             |x |                       
|    |   |- --------------- + ---------------- - ----------------- + -------------------  for |--| > 1                   
|    |   |        _________                3/2                 3/2             _________      | 2|                       
|    |   |       /       2        /      2\           /      2\               /       2       |y |                       
|    |   |      /       x         |     x |         3 |     x |              /       x                                   
|    |   |     /   -1 + --    2*y*|-1 + --|      2*y *|-1 + --|      2*y*   /   -1 + --                                  
|    |   |    /          2        |      2|           |      2|            /          2                                  
|    |   |  \/          y         \     y /           \     y /          \/          y                                   
|    |   |                                                                                                               
|    |   |                   ________                                                                                    
|-   |   <                  /      2                                                                   dx  for sin(x) < 0
|    |   |                 /      x                                                                                      
|    |   |           y*   /   1 - --                                                                                     
|    |   |               /         2                                2                                                    
|    |   |             \/         y            y                   x                                                     
|    |   |           ---------------- + ---------------- - ------------------              otherwise                     
|    |   |                  2                   ________             ________                                            
|    |   |                                     /      2             /      2                                             
|    |   |                                    /      x             /      x                                              
|    |   |                              2*   /   1 - --    2*y*   /   1 - --                                             
|    |   |                                  /         2          /         2                                             
|    |   \                                \/         y         \/         y                                              
|    |                                                                                                                   
|   /                                                                                                                    
| sin(x)                                                                                                                 
<                                                                                                                        
| sin(x)                                                                                                                 
|    /                                                                                                                   
|   |                                                                                                                    
|   |   /                             2                   4                     2            | 2|                        
|   |   |        I*y               I*x                 I*x                 3*I*x             |x |                        
|   |   |- --------------- + ---------------- - ----------------- + -------------------  for |--| > 1                    
|   |   |        _________                3/2                 3/2             _________      | 2|                        
|   |   |       /       2        /      2\           /      2\               /       2       |y |                        
|   |   |      /       x         |     x |         3 |     x |              /       x                                    
|   |   |     /   -1 + --    2*y*|-1 + --|      2*y *|-1 + --|      2*y*   /   -1 + --                                   
|   |   |    /          2        |      2|           |      2|            /          2                                   
|   |   |  \/          y         \     y /           \     y /          \/          y                                    
|   |   |                                                                                                                
|   |   |                   ________                                                                                     
|   |   <                  /      2                                                                   dx     otherwise   
|   |   |                 /      x                                                                                       
|   |   |           y*   /   1 - --                                                                                      
|   |   |               /         2                                2                                                     
|   |   |             \/         y            y                   x                                                      
|   |   |           ---------------- + ---------------- - ------------------              otherwise                      
|   |   |                  2                   ________             ________                                             
|   |   |                                     /      2             /      2                                              
|   |   |                                    /      x             /      x                                               
|   |   |                              2*   /   1 - --    2*y*   /   1 - --                                              
|   |   |                                  /         2          /         2                                              
|   |   \                                \/         y         \/         y                                               
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\  0                                                                                                                     
$$\begin{cases} - \int\limits_{\sin{\left(x \right)}}^{0} \begin{cases} - \frac{i x^{4}}{2 y^{3} \left(\frac{x^{2}}{y^{2}} - 1\right)^{\frac{3}{2}}} + \frac{3 i x^{2}}{2 y \sqrt{\frac{x^{2}}{y^{2}} - 1}} + \frac{i x^{2}}{2 y \left(\frac{x^{2}}{y^{2}} - 1\right)^{\frac{3}{2}}} - \frac{i y}{\sqrt{\frac{x^{2}}{y^{2}} - 1}} & \text{for}\: \left|{\frac{x^{2}}{y^{2}}}\right| > 1 \\- \frac{x^{2}}{2 y \sqrt{- \frac{x^{2}}{y^{2}} + 1}} + \frac{y \sqrt{- \frac{x^{2}}{y^{2}} + 1}}{2} + \frac{y}{2 \sqrt{- \frac{x^{2}}{y^{2}} + 1}} & \text{otherwise} \end{cases}\, dx & \text{for}\: \sin{\left(x \right)} < 0 \\\int\limits_{0}^{\sin{\left(x \right)}} \begin{cases} - \frac{i x^{4}}{2 y^{3} \left(\frac{x^{2}}{y^{2}} - 1\right)^{\frac{3}{2}}} + \frac{3 i x^{2}}{2 y \sqrt{\frac{x^{2}}{y^{2}} - 1}} + \frac{i x^{2}}{2 y \left(\frac{x^{2}}{y^{2}} - 1\right)^{\frac{3}{2}}} - \frac{i y}{\sqrt{\frac{x^{2}}{y^{2}} - 1}} & \text{for}\: \left|{\frac{x^{2}}{y^{2}}}\right| > 1 \\- \frac{x^{2}}{2 y \sqrt{- \frac{x^{2}}{y^{2}} + 1}} + \frac{y \sqrt{- \frac{x^{2}}{y^{2}} + 1}}{2} + \frac{y}{2 \sqrt{- \frac{x^{2}}{y^{2}} + 1}} & \text{otherwise} \end{cases}\, dx & \text{otherwise} \end{cases}$$
Piecewise((-Integral(Piecewise((-i*y/sqrt(-1 + x^2/y^2) + i*x^2/(2*y*(-1 + x^2/y^2)^(3/2)) - i*x^4/(2*y^3*(-1 + x^2/y^2)^(3/2)) + 3*i*x^2/(2*y*sqrt(-1 + x^2/y^2)), |x^2/y^2| > 1), (y*sqrt(1 - x^2/y^2)/2 + y/(2*sqrt(1 - x^2/y^2)) - x^2/(2*y*sqrt(1 - x^2/y^2)), True)), (x, sin(x), 0)), sin(x) < 0), (Integral(Piecewise((-i*y/sqrt(-1 + x^2/y^2) + i*x^2/(2*y*(-1 + x^2/y^2)^(3/2)) - i*x^4/(2*y^3*(-1 + x^2/y^2)^(3/2)) + 3*i*x^2/(2*y*sqrt(-1 + x^2/y^2)), |x^2/y^2| > 1), (y*sqrt(1 - x^2/y^2)/2 + y/(2*sqrt(1 - x^2/y^2)) - x^2/(2*y*sqrt(1 - x^2/y^2)), True)), (x, 0, sin(x))), True))

    Use the examples entering the upper and lower limits of integration.