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((1/2)*(cos(x))^2)'The calculation above is a derivative of the function f (x)
(1/2)'*(cos(x))^2+(1/2)*((cos(x))^2)'
0*(cos(x))^2+(1/2)*((cos(x))^2)'
0*(cos(x))^2+(1/2)*2*(cos(x))^(2-1)*(cos(x))'
0*(cos(x))^2+(1/2)*2*(cos(x))^(2-1)*(-sin(x))
0*(cos(x))^2+(1/2)*-2*cos(x)*sin(x)
-(cos(x)*sin(x))
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