1. Find the limit, if it exists, or show that the limit does not exist. (a) lim xy cos(x - 2y) (x,y) →(6,3) x² - y² (c) lim (x,y)→(0,0) x² + y² 2x²y x² + sin² y (b) lim (x,y)→(0,0) 2x² + y² (d) lim (x,y)→(0,0) x² + y²

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