Suggested: cos pi/2 - cos(pi/2+x)=-sin x - cos pi/2 - theta - cos(pi/2+theta)=-sin theta - cos pi/24 - cos(pi+x)cos(-x)/sin(pi-x)cos(pi/2+x)=cot^2x - 2cos pi/13 cos 9pi/13+ cos3pi/13+cos5pi/13 - integral 0 to pi xsinx/1+cos^2x - prove that cos^2x+cos^2x+pi/3)+cos^2(x-pi/3)=3/2 - cos 2 pi value - z transform of cos(n*pi/2) - integrate log(cos x) dx from 0 to pi/2 - cos pi 2 Browse related:
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