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(5*x*sin(8*x))'The calculation above is a derivative of the function f (x)
(5*x)'*sin(8*x)+5*x*(sin(8*x))'
((5)'*x+5*(x)')*sin(8*x)+5*x*(sin(8*x))'
(0*x+5*(x)')*sin(8*x)+5*x*(sin(8*x))'
(0*x+5*1)*sin(8*x)+5*x*(sin(8*x))'
5*sin(8*x)+5*x*(sin(8*x))'
5*sin(8*x)+5*x*cos(8*x)*(8*x)'
5*sin(8*x)+5*x*cos(8*x)*((8)'*x+8*(x)')
5*sin(8*x)+5*x*cos(8*x)*(0*x+8*(x)')
5*sin(8*x)+5*x*cos(8*x)*(0*x+8*1)
5*sin(8*x)+5*x*8*cos(8*x)
5*sin(8*x)+40*x*cos(8*x)
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