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OpenStudy (anonymous):
Use a double-angle formula to solve the following for x: cos 2x + cos x = 0
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OpenStudy (anonymous):
recall that \[\cos(2x)=1-2\cos^2(x)\] so you get a quadratic equation in cosine
OpenStudy (anonymous):
Ok
OpenStudy (anonymous):
like solving \[1-2z^2+z=0\] you good from there?
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