Find the Derivative of the Function at the Given Value $$f ( x ) = 4 x \cos x ; x = \frac { \pi } { 2 }$$

question 127

Short Answer

Find the derivative of the function at the given value of x using a graphing utility. If necessary, round to four decimal
places.
- $$f ( x ) = 4 x \cos x ; x = \frac { \pi } { 2 }$$

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