Complete the Identity $\sin \theta [ \sin ( 2 \theta ) + \sin ( 4 \theta ) ] = ?$

question 299

Multiple Choice

Complete the identity.
- $\sin \theta [ \sin ( 2 \theta ) + \sin ( 4 \theta ) ] = ?$

• A) \(\cos \theta [ \cos ( 2 \theta ) + \cos ( 4 \theta ) ]\)
• B) \(\frac { 1 } { 2 } \cos \theta [ \cos ( 2 \theta ) + \cos ( 4 \theta ) ]\)
• C) \(\cos \theta [ \cos ( 2 \theta ) - \cos ( 4 \theta ) ]\)
• D) \(\frac { 1 } { 2 } \cos \theta [ \cos ( 2 \theta ) - \cos ( 4 \theta ) ]\)

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