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(cos(0.5*x))'The calculation above is a derivative of the function f (x)
-sin(0.5*x)*(0.5*x)'
-sin(0.5*x)*((0.5)'*x+0.5*(x)')
-sin(0.5*x)*(0*x+0.5*(x)')
-sin(0.5*x)*(0*x+0.5*1)
0.5*(-sin(0.5*x))
-0.5*sin(0.5*x)
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