Use NDER on a Calculator to Find the Numerical Derivative $$f ( x ) = x \sin ( 4 x ) \text { at } x = 9$$

Multiple Choice

Use NDER on a calculator to find the numerical derivative of the function at the specified point.
- $$f ( x ) = x \sin ( 4 x ) \text { at } x = 9$$

A) $- 8925.9388$
B) $8925.9388$
C) $- 4.6062$
D) $- 5.5985$