Find the Derivative of the Function $r ( x ) = 4 x \cos x + 9 x ^ { 2 } + 8$

Find the derivative of the function. $r ( x ) = 4 x \cos x + 9 x ^ { 2 } + 8$

A) $r'( x ) = - 4 x \cos x + 4 \cos x + 18 x$
B) $r' ( x ) = - 4 x \sin x + 4 \cos x + 18 x$
C) $r '( x ) = - 4 x \sin x + 4 \cos x - 18 x$
D) $r '( x ) = - 4 x \sin x + 4 \sin x + 18 x$
E) $r '( x ) = 4 x \sin x - 4 \cos x + 18 x$

Correct Answer:

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