The general solution of the following...

The general solution of the following equation : `2(sinx-cos2x)-sin2x)\ (1+2sinx)+2cosx=0` is/are `x=2npi\ ;\ n in I` (b) `npi+(-1)^n(-pi/2);\ n in I` `x=npi+(-1)^npi/6;\ n in I` `x=npi+(-1)^npi/4;\ n in I`

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