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It is given that A is an obtuse angle and cosA=-sqrt5/3.Without using calculator,find the value of cos 3A

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  1. bradely
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    step by step answers posted here http://www.mathskey.com/question2answer/4128/it-is-given-that-a-is-an-obtuse-angle-and-cosa-sqrt5-3 ask your trigonometric homework questions at http://www.mathskey.com/question2answer/… and get free math help. all the best

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  2. Erichooi
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