2sin(2x)cos(-x)=0
sin(2x)cos(-x)=0
sin(2x)cos(x)=0
sin(2x)=0 ; cos(x)=0
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2sin(2x)cos(-x)=0
sin(2x)cos(-x)=0
sin(2x)cos(x)=0
sin(2x)=0 ; cos(x)=0