Express the Product as a Sum Containing Only Sines or Cosines

question 241

Multiple Choice

Express the product as a sum containing only sines or cosines.
- $\sin ( 3 \theta ) \cos ( 4 \theta )$

• A) \(\sin \cos \left( 12 \theta ^ { 2 } \right)\)
• B) \(\frac { 1 } { 2 } [ \cos ( 7 \theta ) + \sin \theta ]\)
• C) \(\frac { 1 } { 2 } [ \cos ( 7 \theta ) - \cos \theta ]\)
• D) \(\frac { 1 } { 2 } [ \sin ( 7 \theta ) - \sin \theta ]\)

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