Find the Expression as the Cosine of an Angle $$\cos \frac { \pi } { 5 } \cos \frac { \pi } { 3 } - \sin \frac { \pi } { 5 } \sin \frac { \pi } { 3 }$$

question 27

Multiple Choice

Find the expression as the cosine of an angle. ​​ $$\cos \frac { \pi } { 5 } \cos \frac { \pi } { 3 } - \sin \frac { \pi } { 5 } \sin \frac { \pi } { 3 }$$ ​

• A) \(\sin \frac { 15 \pi } { 8 }\)
• B) \(\cos \frac { 15 \pi } { 8 }\)
• C) \(\cos \frac { 8 \pi } { 15 }\)
• D) \(\cos \frac { \pi } { 15 }\)
• E) \(\sin \frac { 8 \pi } { 15 }\)

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