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6-117.

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

$2\operatorname{cos} x$

$−2\operatorname{cos} x\operatorname{sin} x$

$−\operatorname{sin} 2x$

I only

II only

III only

II and III

none

Hint:

There may be more than one correct answer.

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