If |2sintheta-cos e ctheta|geq1a n dthet...

If `|2sintheta-cos e ctheta|geq1a n dtheta!=(npi)/2,n in Z ,` then `cos2thetageq1/2` (b) `cos2thetageq1/4` `cos2thetalt=1/2` (d) `cos2thetalt=1/4`

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