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(sin(x)-(1/x))'The calculation above is a derivative of the function f (x)
(sin(x))'+(-(1/x))'
cos(x)+(-(1/x))'
cos(x)+((1)'*x-(1*(x)'))/(x^2)
cos(x)+(0*x-(1*(x)'))/(x^2)
cos(x)+(0*x-(1*1))/(x^2)
cos(x)+x^-2
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