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AP® Calculus AB-BC

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Moderate

Smallest Local Minimum: Trigonometric Function

APCALC-SE5E18

If $f'(x) = \cos ({3^x})$, then the smallest value of $x$ for which $f$ has a relative maximum is:

A

$0.411$

B

$1.042$

C

$1.411$

D

$1.673$