cos^2(x)=1-sin^2(x) 2*cos^2(x)+3sin(x)=0 2(1-sin^2(x))+3sin(x)=0 2*sin^2(x)-3sin(x)-2=0 sin(x)=t then 2*t^2-3t-2=0 t=2 or t=-0.5 |sin(x)|<=1 so t=2 haveno solution sin(x)=-0.5 then x=-pi/3+2*pi*n, x=7/3*pi+2*pi*n where n is integer
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