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(20*cos(5*x))'The calculation above is a derivative of the function f (x)
(20)'*cos(5*x)+20*(cos(5*x))'
0*cos(5*x)+20*(cos(5*x))'
0*cos(5*x)+20*-sin(5*x)*(5*x)'
0*cos(5*x)+20*-sin(5*x)*((5)'*x+5*(x)')
0*cos(5*x)+20*-sin(5*x)*(0*x+5*(x)')
0*cos(5*x)+20*-sin(5*x)*(0*x+5*1)
0*cos(5*x)+20*5*(-sin(5*x))
0*cos(5*x)+20*-5*sin(5*x)
-100*sin(5*x)
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