`y = 5cos(9x + 1)` Find the derivative of the function.

Textbook Question

Chapter 2, Review - Problem 57 - Calculus of a Single Variable (10th Edition, Ron Larson).
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hkj1385 | (Level 1) Assistant Educator

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Note:- If y = cos(ax) ; then dy/dx = -a*sin(ax)

Now, 

`y = 5cos(9x + 1)`

`dy/dx = y' = -5*(sin(9x+1))*9`

`or, dy/dx = y' = -45sin(9x+1)`

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