Complete the identity.
-$\cos \left( x + \frac { \pi } { 2 } \right) =$ ?
A) $- \sin x$
B) $\sin x$
C) $\cos x$
D) $- \cos x$

Name: Complete the identity. -$\cos \left( x + \frac { \pi } { 2 } \right) =$ ? A) $- \sin x$ B) $\sin x$ C) $\cos x$ D) $- \cos x$
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Question

Quizplus · Accepted Answer

The identity $\cos \left( x + \frac { \pi } { 2 } \right) = - \sin x$ is a result of the co-function identity for cosine, taking into account the phase shift of $\frac{\pi}{2}$ radians.

Complete the Identity cos⁡(x+π2)=\cos \left( x + \frac { \pi } { 2 } \right) =cos(x+2π​)=

Complete the Identity $\cos \left( x + \frac { \pi } { 2 } \right) =$