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

question 154

Multiple Choice

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

• A) \(\cos \left( \frac { \pi } { 7 } + x \right)\)
• B) \(\sin \left( \frac { \pi } { 7 } - x \right)\)
• C) \(\sin \left( \frac { \pi } { 7 } + x \right)\)
• D) \(\cos \left( \frac { \pi } { 7 } - x \right)\)

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