Show That the Equation Is Not an Identity by Finding $\left[ - \pi , \pi , \frac { \pi } { 2 } \right]$

Multiple Choice

Show that the equation is not an identity by finding a value of x for which both sides are defined but not equal.
-Graph in a $\left[ - \pi , \pi , \frac { \pi } { 2 } \right]$ by $[ - 3,3,1 ]$ viewing rectangle $y = 2 \left( \frac { \sin x } { 1 } - \frac { \sin 2 x } { 2 } + \frac { \sin 3 x } { 3 } - \frac { \sin 4 x } { 4 } + \frac { \sin 5 x } { 5 } - \frac { \sin 6 x } { 6 } + \frac { \sin 7 x } { 7 } \right)$

A)

B)

C)

D)