Let $f ( x ) = \sin x - e ^ { x }$ If $x \in [ - \pi , 3 \pi ]$ then ƒ has a horizontal tangent line for each x in
A)0
B) $\left\{ \frac { \pi } { 2 } \right\}$
C) $\{ \pi \}$
D) $\left\{ \frac { 3 \pi } { 2 } \right\}$
E) $\{ 0,2 \pi \}$

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The Answer of Let $f ( x ) = \sin x - e ^ { x }$ If $x \in [ - \pi , 3 \pi ]$ then ƒ has a horizontal tangent line for each x in
A)0
B) $\left\{ \frac { \pi } { 2 } \right\}$
C) $\{ \pi \}$
D) $\left\{ \frac { 3 \pi } { 2 } \right\}$
E) $\{ 0,2 \pi \}$

Let f(x)=sin⁡x−exf ( x ) = \sin x - e ^ { x }f(x)=sinx−ex

Let $f ( x ) = \sin x - e ^ { x }$