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