Mathematics
Mathematics, 14.11.2021 21:00, mothertrucker2828

PLEASE HELP ME!!! ASAP SHOW YOUR WORK!!!

Given cos x = - √15/4 and 90°< x <180°, find the exact value for cos 2x

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PLEASE HELP ME!!! ASAP SHOW YOUR WORK!!!

Given cos x = - √15/4 and 90°< x <180°,...

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