Mister Exam

Derivative of log(sin(x))

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

The graph:

from to

Piecewise:

The solution

You have entered [src]
log(sin(x))
log(sin(x))\log{\left(\sin{\left(x \right)} \right)}
d              
--(log(sin(x)))
dx             
ddxlog(sin(x))\frac{d}{d x} \log{\left(\sin{\left(x \right)} \right)}
Detail solution
  1. Let u=sin(x)u = \sin{\left(x \right)}.

  2. The derivative of log(u)\log{\left(u \right)} is 1u\frac{1}{u}.

  3. Then, apply the chain rule. Multiply by ddxsin(x)\frac{d}{d x} \sin{\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)}

    The result of the chain rule is:

    cos(x)sin(x)\frac{\cos{\left(x \right)}}{\sin{\left(x \right)}}

  4. Now simplify:

    1tan(x)\frac{1}{\tan{\left(x \right)}}


The answer is:

1tan(x)\frac{1}{\tan{\left(x \right)}}

The graph
02468-8-6-4-2-1010-200200
The first derivative [src]
cos(x)
------
sin(x)
cos(x)sin(x)\frac{\cos{\left(x \right)}}{\sin{\left(x \right)}}
The second derivative [src]
 /       2   \
 |    cos (x)|
-|1 + -------|
 |       2   |
 \    sin (x)/
(1+cos2(x)sin2(x))- (1 + \frac{\cos^{2}{\left(x \right)}}{\sin^{2}{\left(x \right)}})
The third derivative [src]
  /       2   \       
  |    cos (x)|       
2*|1 + -------|*cos(x)
  |       2   |       
  \    sin (x)/       
----------------------
        sin(x)        
2(1+cos2(x)sin2(x))cos(x)sin(x)\frac{2 \cdot \left(1 + \frac{\cos^{2}{\left(x \right)}}{\sin^{2}{\left(x \right)}}\right) \cos{\left(x \right)}}{\sin{\left(x \right)}}
The graph
Derivative of log(sin(x))