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Chain Rule Solve x n = e (n ln x) = e u (n ln x) (Set u = n ln x) = e (n ln x) n/x = x n n/x = n x (n1) QED Proof of x n from the Integral Given x n dx = x (n1) /(n1) c;E−λ = λ The easiest way to get the variance is to first calculate EX(X −1), because this will let us use the same sort of trick about factorials and the exponentialFind the latest United States Steel Corporation (X) stock quote, history, news and other vital information to help you with your stock trading and investing Xk[s[ ^"u[ Xe"X