4(1+sin(x))=cos^2(x) we know that cos^2(x)=1-sin^2(x) so 4+4sin(x)=1-sin^2(x) let sin(x)=t 3+4t+t^2=0 t=-1 or t=-3 but | sin(x) |<=1 for every x from R sin(x)=-1 x=pi+2*pi*n, where n from Z
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