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

question 201

Multiple Choice

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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