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| 2017-04-13 15:52:52 +0200 | asked a question | How to prove the following equation:cos*2(180+x)+tan(x-180)sin(720-x)cosx=cos2x I have tried solving it but I just can't get it right |
Copyright Sage, 2010. Some rights reserved under creative commons license. Content on this site is licensed under a Creative Commons Attribution Share Alike 3.0 license.