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1/(cos^2x)-1
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Similar expressions
1/(cos^2x)+1

The derivative of the function/ 1/(cos^2x)-1

Derivative of 1/(cos^2x)-1

The solution

You have entered [src]

   1       
------- - 1
   2       
cos (x)

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

1/(cos(x)^2) - 1

Detail solution

Differentiate $-1 + \frac{1}{\cos^{2}{\left(x \right)}}$ term by term:
1. Let $u = \cos^{2}{\left(x \right)}$ .
2. Apply the power rule: $\frac{1}{u}$ goes to $- \frac{1}{u^{2}}$
3. Then, apply the chain rule. Multiply by $\frac{d}{d x} \cos^{2}{\left(x \right)}$ :
  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:
    
    $- 2 \sin{\left(x \right)} \cos{\left(x \right)}$
  The result of the chain rule is:
  
  $\frac{2 \sin{\left(x \right)}}{\cos^{3}{\left(x \right)}}$
4. The derivative of the constant $-1$ is zero.
The result is: $\frac{2 \sin{\left(x \right)}}{\cos^{3}{\left(x \right)}}$

The answer is:

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

The graph

Plot the graph f(x)

Plot the graph f'(x)

The first derivative [src]

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

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

Simplify

The second derivative [src]

  /         2   \
  |    3*sin (x)|
2*|1 + ---------|
  |        2    |
  \     cos (x) /
-----------------
        2        
     cos (x)

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

Simplify

The third derivative [src]

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

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

Simplify

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Derivative of 1/(cos^2x)-1

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The solution