Convert the Expression into a Product $\cos \frac { 3 \pi } { 8 } - \sin \frac { \pi } { 8 }$

question 7

Multiple Choice

Convert the expression into a product. Simplify where possible. $\cos \frac { 3 \pi } { 8 } - \sin \frac { \pi } { 8 }$ (Hint: Use the identity $\cos \theta = \sin \left( \frac { \pi } { 2 } - \theta \right)$ .)

• A) \(\frac { \sqrt { 2 } } { 2 }\)
• B) 1/2
• C) 1
• D) 0
• E) \(\frac { \sqrt { 3 } } { 2 }\)

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