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The derivative of the function/ sin(x)/cos^2(x)

Derivative of sin(x)/cos^2(x)

The solution

You have entered [src]

 sin(x)
-------
   2   
cos (x)

$$\frac{\sin{\left(x \right)}}{\cos^{2}{\left(x \right)}}$$

sin(x)/cos(x)^2

Detail solution

Apply the quotient rule, which is:

$\frac{d}{d x} \frac{f{\left(x \right)}}{g{\left(x \right)}} = \frac{- f{\left(x \right)} \frac{d}{d x} g{\left(x \right)} + g{\left(x \right)} \frac{d}{d x} f{\left(x \right)}}{g^{2}{\left(x \right)}}$

$f{\left(x \right)} = \sin{\left(x \right)}$ and $g{\left(x \right)} = \cos^{2}{\left(x \right)}$ .

To find $\frac{d}{d x} f{\left(x \right)}$ :
1. The derivative of sine is cosine:
  
  $\frac{d}{d x} \sin{\left(x \right)} = \cos{\left(x \right)}$
To find $\frac{d}{d x} g{\left(x \right)}$ :
1. Let $u = \cos{\left(x \right)}$ .
2. Apply the power rule: $u^{2}$ goes to $2 u$
3. Then, apply the chain rule. Multiply by $\frac{d}{d x} \cos{\left(x \right)}$ :
  1. The derivative of cosine is negative sine:
    
    $\frac{d}{d x} \cos{\left(x \right)} = - \sin{\left(x \right)}$
  The result of the chain rule is:
  
  $- 2 \sin{\left(x \right)} \cos{\left(x \right)}$
Now plug in to the quotient rule:

$\frac{2 \sin^{2}{\left(x \right)} \cos{\left(x \right)} + \cos^{3}{\left(x \right)}}{\cos^{4}{\left(x \right)}}$
Now simplify:

$\frac{\sin^{2}{\left(x \right)} + 1}{\cos^{3}{\left(x \right)}}$

The answer is:

$\frac{\sin^{2}{\left(x \right)} + 1}{\cos^{3}{\left(x \right)}}$

The graph

Plot the graph f(x)

Plot the graph f'(x)

The first derivative [src]

               2   
 cos(x)   2*sin (x)
------- + ---------
   2          3    
cos (x)    cos (x)

$$\frac{2 \sin^{2}{\left(x \right)}}{\cos^{3}{\left(x \right)}} + \frac{\cos{\left(x \right)}}{\cos^{2}{\left(x \right)}}$$

Simplify

The second derivative [src]

/         2   \       
|    6*sin (x)|       
|5 + ---------|*sin(x)
|        2    |       
\     cos (x) /       
----------------------
          2           
       cos (x)

$$\frac{\left(\frac{6 \sin^{2}{\left(x \right)}}{\cos^{2}{\left(x \right)}} + 5\right) \sin{\left(x \right)}}{\cos^{2}{\left(x \right)}}$$

Simplify

The third derivative [src]

                           /         2   \
                      2    |    3*sin (x)|
                 8*sin (x)*|2 + ---------|
          2                |        2    |
    12*sin (x)             \     cos (x) /
5 + ---------- + -------------------------
        2                    2            
     cos (x)              cos (x)         
------------------------------------------
                  cos(x)

$$\frac{\frac{8 \left(\frac{3 \sin^{2}{\left(x \right)}}{\cos^{2}{\left(x \right)}} + 2\right) \sin^{2}{\left(x \right)}}{\cos^{2}{\left(x \right)}} + \frac{12 \sin^{2}{\left(x \right)}}{\cos^{2}{\left(x \right)}} + 5}{\cos{\left(x \right)}}$$

Simplify

The graph

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Derivative of sin(x)/cos^2(x)

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The solution