How do you differentiate f(x)=cot(3x) using the chain rule?
1 Answer
Feb 9, 2016
Explanation:
First, I assume you know that the derivative of
We substitute
Therefore,
dudx=3 .
Now we use the chain rule.
ddx(cot(3x))=ddx(cot(u))
=ddu(cot(u))⋅dudx
=−csc2(u)⋅3
=−3csc2(3x)