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(3*cos(3*x)*sin(3*x))'The calculation above is a derivative of the function f (x)
(3*cos(3*x))'*sin(3*x)+3*cos(3*x)*(sin(3*x))'
((3)'*cos(3*x)+3*(cos(3*x))')*sin(3*x)+3*cos(3*x)*(sin(3*x))'
(0*cos(3*x)+3*(cos(3*x))')*sin(3*x)+3*cos(3*x)*(sin(3*x))'
(0*cos(3*x)+3*-sin(3*x)*(3*x)')*sin(3*x)+3*cos(3*x)*(sin(3*x))'
(0*cos(3*x)+3*-sin(3*x)*((3)'*x+3*(x)'))*sin(3*x)+3*cos(3*x)*(sin(3*x))'
(0*cos(3*x)+3*-sin(3*x)*(0*x+3*(x)'))*sin(3*x)+3*cos(3*x)*(sin(3*x))'
(0*cos(3*x)+3*-sin(3*x)*(0*x+3*1))*sin(3*x)+3*cos(3*x)*(sin(3*x))'
(0*cos(3*x)+3*3*(-sin(3*x)))*sin(3*x)+3*cos(3*x)*(sin(3*x))'
(0*cos(3*x)+3*-3*sin(3*x))*sin(3*x)+3*cos(3*x)*(sin(3*x))'
3*cos(3*x)*(sin(3*x))'-9*sin(3*x)*sin(3*x)
3*cos(3*x)*cos(3*x)*(3*x)'-9*sin(3*x)*sin(3*x)
3*cos(3*x)*cos(3*x)*((3)'*x+3*(x)')-9*sin(3*x)*sin(3*x)
3*cos(3*x)*cos(3*x)*(0*x+3*(x)')-9*sin(3*x)*sin(3*x)
3*cos(3*x)*cos(3*x)*(0*x+3*1)-9*sin(3*x)*sin(3*x)
3*cos(3*x)*3*cos(3*x)-9*sin(3*x)*sin(3*x)
9*(cos(3*x))^2-(9*(sin(3*x))^2)
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