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OpenStudy (anonymous):
solve 2sin^2x-cosx-1=0 for all values of x if x is masured in radians
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OpenStudy (anonymous):
x = 90 degrees because if you substitute x = 90 degrees then the equation is satisfied. I think 90 degrees is pi/2 radians
OpenStudy (mertsj):
Replace sin^2 x with 1-cos^2 x
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