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Write the expression as either the sine, cosine, or tangent of a single angle.
 one year ago
 one year ago
Write the expression as either the sine, cosine, or tangent of a single angle.
 one year ago
 one year ago

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sirm3dBest ResponseYou've already chosen the best response.1
the problem resembles that of a cosine of a difference of two angles
 one year ago

sirm3dBest ResponseYou've already chosen the best response.1
\[\cos (AB)=\cos A \cos B + \sin A \sin B\]
 one year ago

mitchelsewbaranBest ResponseYou've already chosen the best response.0
so is it cosin(pi/5 pi/7)?
 one year ago

sirm3dBest ResponseYou've already chosen the best response.1
you should combine pi/5pi/7 into one angle, as required in the problem.
 one year ago

sirm3dBest ResponseYou've already chosen the best response.1
\[\frac{\pi}{5}\frac{\pi}{7}=\frac{7\pi5\pi}{35}=\frac{2\pi}{35}\]
 one year ago
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