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Asked by Erin

Find the exact trigonometric function of cos(2a).

hyp: 17
opp: 15
adj: 8
7 years ago

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Answered by Reiny
assuming that your given triangle contains angle a
sina = 15/17, cosa = 8/17
cos(2a) = cos^2 a - sin^2 a
= ...
7 years ago
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Question

Find the exact trigonometric function of cos(2a).

hyp: 17
opp: 15
adj: 8

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