Question: a) Evaluate the limit or show that it does not exist: x + y x + y lim (x,y) (0,0) b) Let f(x, y,

a) Evaluate the limit or show that it does not exist: x + y x + y lim (x,y) (0,0) b) Let f(x, y, z) = In(x + y) xyz x+y+z C- 1 (x, y, z) (0, 0, 0) (x, y, z) = (0, 0, 0) Find the value of c, if any, so that f is continuous at (0,0,0). Justify your answer.

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