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