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(20*cos(10*x+pi/6))'The calculation above is a derivative of the function f (x)
(20)'*cos(10*x+pi/6)+20*(cos(10*x+pi/6))'
0*cos(10*x+pi/6)+20*(cos(10*x+pi/6))'
0*cos(10*x+pi/6)+20*-sin(10*x+pi/6)*(10*x+pi/6)'
0*cos(10*x+pi/6)+20*-sin(10*x+pi/6)*((10*x)'+(pi/6)')
0*cos(10*x+pi/6)+20*-sin(10*x+pi/6)*(10*(x)'+(10)'*x+(pi/6)')
0*cos(10*x+pi/6)+20*-sin(10*x+pi/6)*(10*(x)'+0*x+(pi/6)')
0*cos(10*x+pi/6)+20*-sin(10*x+pi/6)*(0*x+(pi/6)'+10*1)
0*cos(10*x+pi/6)+20*10*(-sin(10*x+pi/6))
0*cos(10*x+pi/6)+20*-10*sin(10*x+pi/6)
-200*sin(10*x+pi/6)
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