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OpenStudy (anonymous):
How would you solve: -sinx+cos(2x)=0 ?
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OpenStudy (anonymous):
convert cos 2x into 1 - 2sin^2 x and solve quadratically
OpenStudy (anonymous):
why can you do that?
OpenStudy (anonymous):
cos2x = cos^2x - sin ^2x cos^2x= 1 - sin^2x
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