Show That the Equation Is Not an Identity by Finding $\sin 2 x + \sin 4 x = \sin 5 x$

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.
- $\sin 2 x + \sin 4 x = \sin 5 x$

A) $\frac { \pi } { 2 }$
B) 0
C) $\pi$
D) $2 \pi$