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OpenStudy (dtan5457):
Verify the x value 2cos^4x-cos^2x=0 x=pi/2
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OpenStudy (dtan5457):
so I know that the cos 90 degrees is just 1. so the exponents here don't really do anything. isn't this 2-1=1?
OpenStudy (dtan5457):
@EclipsedStar @iambatman
ganeshie8 (ganeshie8):
cos(90) is not 1
OpenStudy (dtan5457):
crud
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OpenStudy (dtan5457):
cos 90=0, 0-0=0, got it, thanks
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