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anonymous
 3 years ago
Write the expression as either the sine, cosine, or tangent of a single angle.
anonymous
 3 years ago
Write the expression as either the sine, cosine, or tangent of a single angle.

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anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0the problem resembles that of a cosine of a difference of two angles

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0\[\cos (AB)=\cos A \cos B + \sin A \sin B\]

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0so is it cosin(pi/5 pi/7)?

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0you should combine pi/5pi/7 into one angle, as required in the problem.

anonymous
 3 years ago
Best ResponseYou've already chosen the best response.0\[\frac{\pi}{5}\frac{\pi}{7}=\frac{7\pi5\pi}{35}=\frac{2\pi}{35}\]
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