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Given cosA=-3/5 in quadrant 2 and cotB=-12/5 in quadrant 4, find cos2A

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Please answer, math homework is killer

trigonometric-functions

asked Dec 3, 2014 in TRIGONOMETRY by anonymous

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1 Answer

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Given value of trigonometric function is

Apply formula :

Solution : Cos2A = -7/25.

answered Dec 3, 2014 by Shalom Scholar
edited Dec 3, 2014 by Shalom

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