Mister Exam

Derivative of 2cos(y)^2

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

The graph:

from to

Piecewise:

The solution

You have entered [src]
     2   
2*cos (y)
$$2 \cos^{2}{\left(y \right)}$$
2*cos(y)^2
Detail solution
  1. The derivative of a constant times a function is the constant times the derivative of the function.

    1. Let .

    2. Apply the power rule: goes to

    3. Then, apply the chain rule. Multiply by :

      1. The derivative of cosine is negative sine:

      The result of the chain rule is:

    So, the result is:

  2. Now simplify:


The answer is:

The graph
The first derivative [src]
-4*cos(y)*sin(y)
$$- 4 \sin{\left(y \right)} \cos{\left(y \right)}$$
The second derivative [src]
  /   2         2   \
4*\sin (y) - cos (y)/
$$4 \left(\sin^{2}{\left(y \right)} - \cos^{2}{\left(y \right)}\right)$$
The third derivative [src]
16*cos(y)*sin(y)
$$16 \sin{\left(y \right)} \cos{\left(y \right)}$$