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6- Write a rational function r(x) such that 5- r(-1) is undefined, lim r(x) = -3, and r--1 4- lim r(x) = co. 20 - - 2 2 r (a) = 4 - 3 -2 -1 0 . 1 2 3 4 -2 - 3 - 5 6