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(3*3.14*20*cos(3.14*20*x))'The calculation above is a derivative of the function f (x)
(3*3.14*20)'*cos(3.14*20*x)+3*3.14*20*(cos(3.14*20*x))'
0*cos(3.14*20*x)+3*3.14*20*(cos(3.14*20*x))'
0*cos(3.14*20*x)+3*3.14*20*-sin(3.14*20*x)*(3.14*20*x)'
0*cos(3.14*20*x)+3*3.14*20*-sin(3.14*20*x)*((3.14*20)'*x+3.14*20*(x)')
0*cos(3.14*20*x)+3*3.14*20*-sin(3.14*20*x)*(0*x+3.14*20*(x)')
0*cos(3.14*20*x)+3*3.14*20*-sin(3.14*20*x)*(0*x+3.14*20*1)
0*cos(3.14*20*x)+3*3.14*20*62.8*(-sin(3.14*20*x))
0*cos(3.14*20*x)+3*3.14*20*-62.8*sin(62.8*x)
-11831.52*sin(62.8*x)
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