/pi*t\
2*pi*sin|----|
\ 3 /
--------------
3
/ /pi*t\\ |2*pi*sin|----|| d | \ 3 /| --|--------------| dt\ 3 /
The derivative of a constant times a function is the constant times the derivative of the function.
Let .
The derivative of sine is cosine:
Then, apply the chain rule. Multiply by :
The derivative of a constant times a function is the constant times the derivative of the function.
Apply the power rule: goes to
So, the result is:
The result of the chain rule is:
So, the result is:
The answer is:
2 /pi*t\
2*pi *cos|----|
\ 3 /
---------------
9
3 /pi*t\
-2*pi *sin|----|
\ 3 /
----------------
27
4 /pi*t\
-2*pi *cos|----|
\ 3 /
----------------
81