Find the Derivative of the Function $f ( x ) = 9 \sin x - 8 \cos x$

Find the derivative of the function. $f ( x ) = 9 \sin x - 8 \cos x$

A) $f ^ { \prime } ( x ) = 9 \cos x + 8 \sin x$
B) $f ^ { \prime } ( x ) = 8 \cos x - 9 \sin x$
C) $f ^ { \prime } ( x ) = 9 \cos x - 8 \sin x$
D) $f ^ { \prime } ( x ) = - 9 \cos x - 8 \sin x$
E) $f ^ { \prime } ( x ) = 8 \cos x + 9 \sin x$

Correct Answer:

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