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(sin(x)/x)'The calculation above is a derivative of the function f (x)
((sin(x))'*x-(sin(x)*(x)'))/(x^2)
(cos(x)*x-(sin(x)*(x)'))/(x^2)
(cos(x)*x-(sin(x)*1))/(x^2)
(x*cos(x)-sin(x))/(x^2)
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