Derivative of cos^2(8x) ❖ Calculus ❖ Trig Derivatives with Chain Rule
Derivative of cos^2(8x) ❖ Calculus ❖ Trig Derivatives with Chain Rule

#### Problem Statement: CE Board November 1995

What is the derivative with respect to x of 2cos^2(x^2+2)?

• A. 2sin (x^2 + 2) cos (x^2 + 2)
• B. -2sin (x^2 + 2) cos (x^2 + 2)
• C. 8x sin (x^2 + 2) cos (x^2 + 2)
• D. -8x sin (x^2 + 2) cos (x^2 + 2)

The derivative is equal to 8xsin(x^2 + 2)cos(x^2 + 2)

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