The Equation $y = A \sin \left( k x - ? t + \frac { \pi } { 2 } \right)$

Multiple Choice

The equation $y = A \sin \left( k x - ? t + \frac { \pi } { 2 } \right)$ is the same as

A) $y = - A \sin \left( k x - \omega t + \frac { \pi } { 2 } \right)$
B) $y = A \cos ( k x - ? t )$
C) $y = - A \cos ( k x - \omega t )$
D) $y = - A \sin \left( k x - \omega t - \frac { \pi } { 2 } \right)$
E) $y = A \sin \left( k x - \omega t + \frac { 3 \pi } { 2 } \right)$