Integral of cost^2 dt

The solution

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 pi           
  /           
 |            
 |     2      
 |  cos (t) dt
 |            
/             
0

$$\int\limits_{0}^{\pi} \cos^{2}{\left(t \right)}\, dt$$

Simplify

Detail solution

Rewrite the integrand:

$\cos^{2}{\left(t \right)} = \frac{\cos{\left(2 t \right)}}{2} + \frac{1}{2}$
Integrate term-by-term:
1. The integral of a constant times a function is the constant times the integral of the function:
  
  $\int \frac{\cos{\left(2 t \right)}}{2}\, dt = \frac{\int \cos{\left(2 t \right)}\, dt}{2}$
  1. Let $u = 2 t$ .
    
    Then let $du = 2 dt$ and substitute $\frac{du}{2}$ :
    
    $\int \frac{\cos{\left(u \right)}}{4}\, du$
    1. The integral of a constant times a function is the constant times the integral of the function:
      
      $\int \frac{\cos{\left(u \right)}}{2}\, du = \frac{\int \cos{\left(u \right)}\, du}{2}$
      1. The integral of cosine is sine:
        
        $\int \cos{\left(u \right)}\, du = \sin{\left(u \right)}$
      So, the result is: $\frac{\sin{\left(u \right)}}{2}$
    Now substitute $u$ back in:
    
    $\frac{\sin{\left(2 t \right)}}{2}$
  So, the result is: $\frac{\sin{\left(2 t \right)}}{4}$
1. The integral of a constant is the constant times the variable of integration:
  
  $\int \frac{1}{2}\, dt = \frac{t}{2}$
The result is: $\frac{t}{2} + \frac{\sin{\left(2 t \right)}}{4}$
Add the constant of integration:

$\frac{t}{2} + \frac{\sin{\left(2 t \right)}}{4}+ \mathrm{constant}$

The answer is:

$\frac{t}{2} + \frac{\sin{\left(2 t \right)}}{4}+ \mathrm{constant}$

The answer (Indefinite) [src]

  /                             
 |                              
 |    2             t   sin(2*t)
 | cos (t) dt = C + - + --------
 |                  2      4    
/

$${{{{\sin \left(2\,t\right)}\over{2}}+t}\over{2}}$$

Simplify

The graph

Plot the graph f(x)

The answer [src]

pi
--
2

$$\frac{\pi}{2}$$

pi
--
2

$$\frac{\pi}{2}$$

Simplify

Numerical answer [src]

1.5707963267949

1.5707963267949

The graph

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

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Integral of cost^2 dt

Limits of integration:

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The solution