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(3*x^2*cos(5*x))'The calculation above is a derivative of the function f (x)
(3*x^2)'*cos(5*x)+3*x^2*(cos(5*x))'
((3)'*x^2+3*(x^2)')*cos(5*x)+3*x^2*(cos(5*x))'
(0*x^2+3*(x^2)')*cos(5*x)+3*x^2*(cos(5*x))'
(0*x^2+3*2*x^(2-1))*cos(5*x)+3*x^2*(cos(5*x))'
(0*x^2+3*2*x)*cos(5*x)+3*x^2*(cos(5*x))'
6*x*cos(5*x)+3*x^2*(cos(5*x))'
6*x*cos(5*x)+3*x^2*-sin(5*x)*(5*x)'
6*x*cos(5*x)+3*x^2*-sin(5*x)*((5)'*x+5*(x)')
6*x*cos(5*x)+3*x^2*-sin(5*x)*(0*x+5*(x)')
6*x*cos(5*x)+3*x^2*-sin(5*x)*(0*x+5*1)
6*x*cos(5*x)+3*x^2*5*(-sin(5*x))
6*x*cos(5*x)+3*x^2*-5*sin(5*x)
6*x*cos(5*x)-(15*x^2*sin(5*x))
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