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(400*x^-1)'The calculation above is a derivative of the function f (x)
(400)'*x^-1+400*(x^-1)'
0*x^-1+400*(x^-1)'
0*x^-1+400*-1*x^(-1-1)
0*x^-1+400*(-x^-2)
400*(-x)^-2
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