Rewrite the Following as a Product of Trigonometric Functions $$\cos \frac { \pi } { 13 } - \cos \frac { \pi } { 4 }$$

question 422

Multiple Choice

Rewrite the following as a product of trigonometric functions.
- $$\cos \frac { \pi } { 13 } - \cos \frac { \pi } { 4 }$$

• A) \(- 2 \sin \frac { 17 \pi } { 104 } \sin \left( \frac { - 9 \pi } { 104 } \right)\)
• B) \(- 2 \cos \frac { 17 \pi } { 104 } \sin \left( \frac { - 9 \pi } { 104 } \right)\)
• C) \(- 2 \cos \frac { 17 \pi } { 104 } \cos \left( \frac { - 9 \pi } { 104 } \right)\)
• D) \(- 2 \sin \frac { 17 \pi } { 104 } \cos \left( \frac { - 9 \pi } { 104 } \right)\)

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