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2sin2xcos2x-cos2x=0
cos2x(2sin2x-1)=0 maka
cos2x=0 sehingga x= 45, 135
2sin2x-1=0 sehingga 2sin2x=1 dan sin2x=1/2
x=15, 75
jadi x yg memenuhi 15,45,75,135