Write the Expression as the Sine, Cosine, or Tangent of an Angle

question 248

Multiple Choice

Write the expression as the sine, cosine, or tangent of an angle.
- $\cos \frac { \pi } { 7 } \cos \frac { \pi } { 11 } + \sin \frac { \pi } { 7 } \sin \frac { \pi } { 11 }$

• A) \(\sin \frac { 18 \pi } { 77 }\)
• B) \(\cos \frac { 4 \pi } { 77 }\)
• C) \(\sin \frac { 4 \pi } { 77 }\)
• D) \(\cos \frac { 18 \pi } { 77 }\)

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