Complete the Identity $\sin ( 4 \theta ) \sin ( 7 \theta ) \cos ( 4 \theta ) \cos ( 7 \theta ) = ?$

question 56

Multiple Choice

Complete the identity.
- $\sin ( 4 \theta ) \sin ( 7 \theta ) \cos ( 4 \theta ) \cos ( 7 \theta ) = ?$

• A) \(\cos ^ { 2 } ( 56 \theta )\)
• B) \(\frac { \sin ^ { 2 } ( 56 \theta ) } { 4 }\)
• C) \(\frac { \cos ^ { 2 } ( 11 \theta ) + \cos ^ { 2 } ( 3 \theta ) } { 4 }\)
• D) \(\frac { \cos ^ { 2 } ( 3 \theta ) - \cos ^ { 2 } ( 11 \theta ) } { 4 }\)

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