You can put this solution on YOUR website! How to solve: cos^2x=cos2x
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cos(2x) = 2cos^2(x) - 1
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cos^2x = 2cos^2(x) - 1
cos^2(x) = 1
cos(x) = -1, +1
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x = 0 ± n*pi, n = 0,1,2,3...
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PS Use parentheses.
eg cos^2(x) and cos(2x)
