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