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OpenStudy (anonymous):
solve cos2x + 2sin^2x -3 = -2 within 0<=x<=2pi
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OpenStudy (mertsj):
Replace cos(2x) with 1-2sin^2(x)
OpenStudy (anonymous):
i know, but why i get a value of 0?
OpenStudy (mertsj):
What you get is -2 = -2 which means it is true for all real numbers.
OpenStudy (anonymous):
ok, thank you
OpenStudy (mertsj):
yw
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