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(x^2*sin(7*x))'The calculation above is a derivative of the function f (x)
(x^2)'*sin(7*x)+x^2*(sin(7*x))'
2*x^(2-1)*sin(7*x)+x^2*(sin(7*x))'
2*x*sin(7*x)+x^2*(sin(7*x))'
2*x*sin(7*x)+x^2*cos(7*x)*(7*x)'
2*x*sin(7*x)+x^2*cos(7*x)*((7)'*x+7*(x)')
2*x*sin(7*x)+x^2*cos(7*x)*(0*x+7*(x)')
2*x*sin(7*x)+x^2*cos(7*x)*(0*x+7*1)
2*x*sin(7*x)+x^2*7*cos(7*x)
2*x*sin(7*x)+7*x^2*cos(7*x)
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