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Trigonometry
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OpenStudy (anonymous):
Find all solutions of the equation 2\sin^2 x -\cos x =1 Apparently there are 3 solutions, but I don't know how to find them?
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OpenStudy (thomas5267):
\[ \sin^2(x)+\cos^2(x)=1\\ \sin^2(x)=1-\cos^2(x) \]
OpenStudy (anonymous):
OOHHH ok thank you! can't believe I didn't think of that
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