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posted by Maddie on Tuesday, November 27, 2012 at 11:26pm.
If tan y = -4/3 and y is in Q I'VE find cos 2y
well, you know that siny = 3/5 cos2y = 1 - 2sin^2 y or, you know that tan 2y = 2tany/(1-tan^2 y) and sec^2 2y = 1 + tan^2 2y good way to check your answer.
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