Write the Product as a Sum or Difference of Trigonometric $\cos 36 ^ { \circ } \sin 21 ^ { \circ }$

question 84

Multiple Choice

Write the product as a sum or difference of trigonometric functions.
- $\cos 36 ^ { \circ } \sin 21 ^ { \circ }$

• A) \(\frac { 1 } { 2 } \left( \cos 57 ^ { \circ } + \cos 15 ^ { \circ } \right)\)
• B) \(\frac { 1 } { 2 } \left( \sin 57 ^ { \circ } - \sin 15 ^ { \circ } \right)\)
• C) \(\frac { 1 } { 2 } \left( \cos 57 ^ { \circ } - \cos 15 ^ { \circ } \right)\)
• D) \(\frac { 1 } { 2 } \left( \sin 57 ^ { \circ } + \sin 15 ^ { \circ } \right)\)

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