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(3*x*cos(3*x))'The calculation above is a derivative of the function f (x)
(3*x)'*cos(3*x)+3*x*(cos(3*x))'
((3)'*x+3*(x)')*cos(3*x)+3*x*(cos(3*x))'
(0*x+3*(x)')*cos(3*x)+3*x*(cos(3*x))'
(0*x+3*1)*cos(3*x)+3*x*(cos(3*x))'
3*cos(3*x)+3*x*(cos(3*x))'
3*cos(3*x)+3*x*-sin(3*x)*(3*x)'
3*cos(3*x)+3*x*-sin(3*x)*((3)'*x+3*(x)')
3*cos(3*x)+3*x*-sin(3*x)*(0*x+3*(x)')
3*cos(3*x)+3*x*-sin(3*x)*(0*x+3*1)
3*cos(3*x)+3*x*3*(-sin(3*x))
3*cos(3*x)+3*x*-3*sin(3*x)
3*cos(3*x)-(9*x*sin(3*x))
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