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(-(1-x)^-2)'The calculation above is a derivative of the function f (x)
-2*(1-x)^(-2-1)*(1-x)'
-2*(1-x)^(-2-1)*((-x)'+(1)')
-2*(1-x)^(-2-1)*((1)'-1)
-2*(1-x)^(-2-1)*(0-1)
-2*(1-x)^(-2-1)*(-1)
-2*(1-x)^-3
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