Express as a Sum or Difference $\sin 7 t \sin 2 t$

question 3

Multiple Choice

Express as a sum or difference. $\sin 7 t \sin 2 t$

• A) \(\cos ( 5 t ) - \cos ( 9 t )\)
• B) \(\frac { 1 } { 2 } \cos ( 6 t ) - \frac { 1 } { 2 } \cos ( 10 t )\)
• C) \(\sin ( 5 t ) - \sin ( 9 t )\)
• D) \(\frac { 1 } { 2 } \cos ( 5 t ) - \frac { 1 } { 2 } \cos ( 9 t )\)
• E) \(\frac { 1 } { 2 } \sin ( 5 t ) - \frac { 1 } { 2 } \sin ( 9 t )\)

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