In Exercises 49–54, show that the limits do not exist. xy? ху + 1 49. (х, у) —(1,1) у — 1 50. (x, y)→(1, –1) x² – y? lim lim lim x In y хе 52. (х, у) —-(1,0) хе —1 + у 51. lim (x, y)→(0,1) x² + (In y)² tan y – y tan x у — х y + sin x 53. (x, y)→(0,0) X + sin y 54. lim (х, у) ——(1,1) lim

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