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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⁡π7cos⁡π11+sin⁡π7sin⁡π11\cos \frac { \pi } { 7 } \cos \frac { \pi } { 11 } + \sin \frac { \pi } { 7 } \sin \frac { \pi } { 11 }


A) sin⁡18π77\sin \frac { 18 \pi } { 77 }
B) cos⁡4π77\cos \frac { 4 \pi } { 77 }
C) sin⁡4π77\sin \frac { 4 \pi } { 77 }
D) cos⁡18π77\cos \frac { 18 \pi } { 77 }

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