Trigo(maths): how do you arrived to this answer?!
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Trigo(maths): how do you arrived to this answer?!

[From: ] [author: ] [Date: 12-01-29] [Hit: ]
......
cos3x+2cosx=0
cos3x-cosx=-3cosx

thankyou! explain please.

-
Simply take 2cosx to the right hand side of the equation and it becomes
cos3x = - 2 cosx
now subtract cosx from both sides and becomes
cos3x - cosx = -3 cosx
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