Mister Exam

Other calculators

tan^-1x
The derivative of the function/ tan^-1x

Derivative of tan^-1x

Function f() - derivative -N order at the point
v

The graph:

from to

Piecewise:

The solution

You have entered [src] 
  1   
------
tan(x)
1tan⁡(x)\frac{1}{\tan{\left(x \right)}} 
1/tan(x)
Detail solution

  1. Let u=tan⁡(x)u = \tan{\left(x \right)}.

  2. Apply the power rule: 1u\frac{1}{u} goes to −1u2- \frac{1}{u^{2}}

  3. Then, apply the chain rule. Multiply by ddxtan⁡(x)\frac{d}{d x} \tan{\left(x \right)}:

    1. Rewrite the function to be differentiated:

      tan⁡(x)=sin⁡(x)cos⁡(x)\tan{\left(x \right)} = \frac{\sin{\left(x \right)}}{\cos{\left(x \right)}}

    2. Apply the quotient rule, which is:

      ddxf(x)g(x)=−f(x)ddxg(x)+g(x)ddxf(x)g2(x)\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(x)=sin⁡(x)f{\left(x \right)} = \sin{\left(x \right)} and g(x)=cos⁡(x)g{\left(x \right)} = \cos{\left(x \right)}.

      To find ddxf(x)\frac{d}{d x} f{\left(x \right)}:

      1. The derivative of sine is cosine:

        ddxsin⁡(x)=cos⁡(x)\frac{d}{d x} \sin{\left(x \right)} = \cos{\left(x \right)}

      To find ddxg(x)\frac{d}{d x} g{\left(x \right)}:

      1. The derivative of cosine is negative sine:

        ddxcos⁡(x)=−sin⁡(x)\frac{d}{d x} \cos{\left(x \right)} = - \sin{\left(x \right)}

      Now plug in to the quotient rule:

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

    The result of the chain rule is:

    −sin⁡2(x)+cos⁡2(x)cos⁡2(x)tan⁡2(x)- \frac{\sin^{2}{\left(x \right)} + \cos^{2}{\left(x \right)}}{\cos^{2}{\left(x \right)} \tan^{2}{\left(x \right)}}

  4. Now simplify:

    −1sin⁡2(x)- \frac{1}{\sin^{2}{\left(x \right)}}

The answer is:

−1sin⁡2(x)- \frac{1}{\sin^{2}{\left(x \right)}}

The graph
02468-8-6-4-2-1010-1000010000
Plot the graph f(x)
Plot the graph f'(x)
The first derivative [src] 
        2   
-1 - tan (x)
------------
     2      
  tan (x)
−tan⁡2(x)−1tan⁡2(x)\frac{- \tan^{2}{\left(x \right)} - 1}{\tan^{2}{\left(x \right)}}
Simplify
The second derivative [src] 
                /            2   \
  /       2   \ |     1 + tan (x)|
2*\1 + tan (x)/*|-1 + -----------|
                |          2     |
                \       tan (x)  /
----------------------------------
              tan(x)
2(tan⁡2(x)+1tan⁡2(x)−1)(tan⁡2(x)+1)tan⁡(x)\frac{2 \left(\frac{\tan^{2}{\left(x \right)} + 1}{\tan^{2}{\left(x \right)}} - 1\right) \left(\tan^{2}{\left(x \right)} + 1\right)}{\tan{\left(x \right)}}
Simplify
The third derivative [src] 
  /                                3                  2\
  |                   /       2   \      /       2   \ |
  |          2      3*\1 + tan (x)/    5*\1 + tan (x)/ |
2*|-2 - 2*tan (x) - ---------------- + ----------------|
  |                        4                  2        |
  \                     tan (x)            tan (x)     /
2(−3(tan⁡2(x)+1)3tan⁡4(x)+5(tan⁡2(x)+1)2tan⁡2(x)−2tan⁡2(x)−2)2 \left(- \frac{3 \left(\tan^{2}{\left(x \right)} + 1\right)^{3}}{\tan^{4}{\left(x \right)}} + \frac{5 \left(\tan^{2}{\left(x \right)} + 1\right)^{2}}{\tan^{2}{\left(x \right)}} - 2 \tan^{2}{\left(x \right)} - 2\right)
Simplify
The graph
Derivative of tan^-1x
    © Mister Exam – Calculator