13. Compute limit fexs, if it exists, for the following cases: x-xo by f: IR→IR₁ x →lx, xo=1 [Jf: IR - IR²₁ × > (x², ex), Xo=1 → djf.IR²| [co,0>] IR², (x,y) (sin(x-g), → e* (y+¹)_ x + 1) / || (x-y)||, Xo = (0,0)

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