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(4*cos(4*x)*sin(9*x))'The calculation above is a derivative of the function f (x)
(4*cos(4*x))'*sin(9*x)+4*cos(4*x)*(sin(9*x))'
((4)'*cos(4*x)+4*(cos(4*x))')*sin(9*x)+4*cos(4*x)*(sin(9*x))'
(0*cos(4*x)+4*(cos(4*x))')*sin(9*x)+4*cos(4*x)*(sin(9*x))'
(0*cos(4*x)+4*-sin(4*x)*(4*x)')*sin(9*x)+4*cos(4*x)*(sin(9*x))'
(0*cos(4*x)+4*-sin(4*x)*((4)'*x+4*(x)'))*sin(9*x)+4*cos(4*x)*(sin(9*x))'
(0*cos(4*x)+4*-sin(4*x)*(0*x+4*(x)'))*sin(9*x)+4*cos(4*x)*(sin(9*x))'
(0*cos(4*x)+4*-sin(4*x)*(0*x+4*1))*sin(9*x)+4*cos(4*x)*(sin(9*x))'
(0*cos(4*x)+4*4*(-sin(4*x)))*sin(9*x)+4*cos(4*x)*(sin(9*x))'
(0*cos(4*x)+4*-4*sin(4*x))*sin(9*x)+4*cos(4*x)*(sin(9*x))'
4*cos(4*x)*(sin(9*x))'-16*sin(4*x)*sin(9*x)
4*cos(4*x)*cos(9*x)*(9*x)'-16*sin(4*x)*sin(9*x)
4*cos(4*x)*cos(9*x)*((9)'*x+9*(x)')-16*sin(4*x)*sin(9*x)
4*cos(4*x)*cos(9*x)*(0*x+9*(x)')-16*sin(4*x)*sin(9*x)
4*cos(4*x)*cos(9*x)*(0*x+9*1)-16*sin(4*x)*sin(9*x)
4*cos(4*x)*9*cos(9*x)-16*sin(4*x)*sin(9*x)
36*cos(4*x)*cos(9*x)-(16*sin(4*x)*sin(9*x))
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