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

question 144

Multiple Choice

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

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

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