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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)*-sin(x/2)*(x/2)'
0*cos(x/2)+(1/2)*-sin(x/2)*(((x)'*2-(x*(2)'))/(2^2))
0*cos(x/2)+(1/2)*-sin(x/2)*((1*2-(x*(2)'))/(2^2))
0*cos(x/2)+(1/2)*-sin(x/2)*((1*2-(x*0))/(2^2))
0*cos(x/2)+(1/2)*1/2*(-sin(x/2))
0*cos(x/2)+(1/2)*-1/2*sin(x/2)
(-1/4)*sin(x/2)
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