Derivative of trig function

1. The problem statement, all variables and given/known data
How would I find d/dt of (cos)^3(t).
How would I find d/dt of (sin)^3(t)


2. Relevant equations



3. The attempt at a solution
 

Tom Mattson

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I have no idea to do it or I would have show my attempt. All I know is the derivatives of cosx is -sinx and sinx is cosx
 

Tom Mattson

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Haven't you learned about the Chain Rule?
 

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