Find the Derivative of the Function at the Given Value $$f ( x ) = \sin ( 8 x ) ; x = 7$$

Multiple Choice

Find the derivative of the function at the given value of x using a graphing utility. If necessary, round to four decimal
places.
- $$f ( x ) = \sin ( 8 x ) ; x = 7$$

A) 6.8257
B) 521.5343
C) -6.8257
D) -521.5343