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

Question 56

Multiple Choice

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


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

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