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1/4(1-cos^2(2x))+cos(2x)=1
1/4-1/4cos^2(2x)+cos(2x)=1
cos(2x)×(1-1/4cos(2x))=3/4
cos(2x)=3/4 lub 1-1/4cos2x=3/4
cos(2x)=3/4 lub cos(2x)=1