Asked by Erin
Find the exact trigonometric function of cos(2a).
hyp: 17
opp: 15
adj: 8
hyp: 17
opp: 15
adj: 8
Answers
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
= ...
sina = 15/17, cosa = 8/17
cos(2a) = cos^2 a - sin^2 a
= ...
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