CPM Homework Help : APCALC Problem 6-110

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6-110.

Multiple Choice: Which of the following expressions is equal to $\frac { d } { d x }\cos^2(x)$ ?

$2 \cos(x)$

$–2\cos(x)\sin(x)$

$–\sin(2x)$

I only

II only

III only

II and III

none of these

Hint:

There may be more than one correct answer.

More Help:

Check the Trigonometric Identities.

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