Q.The number of roots of the equation $2 \cos^2 x - \cos 2x = 1$ in $[0, 2\pi]$ is

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Q.The number of roots of the equation 2cos⁡2x−cos⁡2x=12 \cos^2 x - \cos 2x = 12cos2x−cos2x=1 in [0,2π][0, 2\pi][0,2π] is