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(e^-7*x*sin(x))'The calculation above is a derivative of the function f (x)
(e^-7*x)'*sin(x)+e^-7*x*(sin(x))'
((e^-7)'*x+e^-7*(x)')*sin(x)+e^-7*x*(sin(x))'
(0*x+e^-7*(x)')*sin(x)+e^-7*x*(sin(x))'
(0*x+e^-7*1)*sin(x)+e^-7*x*(sin(x))'
e^-7*sin(x)+e^-7*x*(sin(x))'
e^-7*sin(x)+e^-7*x*cos(x)
e^-7*sin(x)+e^-7*x*cos(x)
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