Complete the Identity $\sin ( \alpha + \beta ) \cos \beta - \cos ( \alpha + \beta ) \sin \beta = ?$

question 187

Multiple Choice

Complete the identity.
- $\sin ( \alpha + \beta ) \cos \beta - \cos ( \alpha + \beta ) \sin \beta = ?$

• A) \(\sin \alpha \cos \beta - \cos \alpha \sin \beta\)
• B) \(\sin \alpha \cos ^ { 2 } \beta - \sin \alpha \sin ^ { 2 } \beta\)
• C) \(\sin \alpha\)
• D) \(2 \sin \beta \cos \beta ( \sin \alpha - \cos \alpha )\)

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