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(2*cos(3*x))'The calculation above is a derivative of the function f (x)
(2)'*cos(3*x)+2*(cos(3*x))'
0*cos(3*x)+2*(cos(3*x))'
0*cos(3*x)+2*-sin(3*x)*(3*x)'
0*cos(3*x)+2*-sin(3*x)*((3)'*x+3*(x)')
0*cos(3*x)+2*-sin(3*x)*(0*x+3*(x)')
0*cos(3*x)+2*-sin(3*x)*(0*x+3*1)
0*cos(3*x)+2*3*(-sin(3*x))
0*cos(3*x)+2*-3*sin(3*x)
-6*sin(3*x)
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