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