`y = 1 - cos(2x) + 2(cos(x))^2` Find the derivative of the function.

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Chapter 2, Review - Problem 58 - Calculus of a Single Variable (10th Edition, Ron Larson).
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hkj1385 | (Level 1) Assistant Educator

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y = 1- cos(2x) + 2`(cos^2x)`

`dy/dx = y' = 2*sin(2x) - 4*cosx*sinx`

`or, y' = 2sin(2x) - 2sin(2x) = 0`

note: `2sinx*cosx = sin2x`

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