Find the differential of the function at the indicated number.
$$f ( x ) = 13 \sin x + 4 \cos x ; \quad x = \frac { \pi } { 4 }$$
A) $\frac { 9 \sqrt { 2 } } { 2 } d x$
B) $- \frac { 17 \sqrt { 2 } } { 2 } d x$
C) $\frac { 17 \sqrt { 2 } } { 2 } d x$
D) $- \frac { 9 \sqrt { 2 } } { 2 } d x$

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The Answer of Find the differential of the function at the indicated number.
$$f ( x ) = 13 \sin x + 4 \cos x ; \quad x = \frac { \pi } { 4 }$$
A) $\frac { 9 \sqrt { 2 } } { 2 } d x$
B) $- \frac { 17 \sqrt { 2 } } { 2 } d x$
C) $\frac { 17 \sqrt { 2 } } { 2 } d x$
D) $- \frac { 9 \sqrt { 2 } } { 2 } d x$

Find the Differential of the Function at the Indicated Number f(x)=13sin⁡x+4cos⁡x;x=π4f ( x ) = 13 \sin x + 4 \cos x ; \quad x = \frac { \pi } { 4 }f(x)=13sinx+4cosx;x=4π​

Find the Differential of the Function at the Indicated Number $f ( x ) = 13 \sin x + 4 \cos x ; \quad x = \frac { \pi } { 4 }$