Rewrite with only sin x and cos x. sin 2x - cos 2x

asked Oct 18, 2018 35.6k views

5 votes

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4 votes

Sin2x-cos2x
2sinxcosx-2cos^2x-1
2cos^2x+2sinxcosx-1
I think that's how you do this one.

JanC answered Oct 20, 2018

by JanC

7.6k points

4 votes

sin2x = 2sinxcosx
cos2x = (cosx)^2 - (sinx)^2 = 2(cosx)^2 -1 = 1- 2(sinx)^2

Any combination you want is here.

Duy Tran answered Oct 24, 2018

8.1k points

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