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