Find f '(x)if $f ( x ) = e ^ { 6 x } \cos 4 x$ .
A) $\left. - 24 e ^ { 6 x } \sin 4 x \right)$
B) $24 e ^ { 6 x } ( \cos 4 x - \sin 4 x )$
C) $e ^ { 6 x } ( 6 \cos 4 x - 4 \sin 4 x )$
D) $e ^ { 6 x } ( 6 \cos 4 x - 6 \sin 4 x )$

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The Answer of Find f '(x)if $f ( x ) = e ^ { 6 x } \cos 4 x$ .
A) $\left. - 24 e ^ { 6 x } \sin 4 x \right)$
B) $24 e ^ { 6 x } ( \cos 4 x - \sin 4 x )$
C) $e ^ { 6 x } ( 6 \cos 4 x - 4 \sin 4 x )$
D) $e ^ { 6 x } ( 6 \cos 4 x - 6 \sin 4 x )$

Find F '(X)if f(x)=e6xcos⁡4xf ( x ) = e ^ { 6 x } \cos 4 xf(x)=e6xcos4x

Find F '(X)if $f ( x ) = e ^ { 6 x } \cos 4 x$