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