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Question #5a24c

1 Answer

Apr 9, 2016

$x = (\frac{π}{3}) n$ $x=(pi/3)n$

Explanation:

$f'(x)=-3sin (3x)* 3$
$f'(x)=-9sin (3x)$
$-9sin(3x)=0$
$sin(3x)=0$
$3x=sin^-1(0)$
$3x=pi n$
$x=(pi/3)n$

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