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