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Prove that the function f(x,y) is differentiable at (0,0) by using epsilon-delta method. (1) f(x,y) =...

Prove that the function f(x,y) is differentiable at (0,0) by using epsilon-delta method.

(1) f(x,y) = x+y+xy

(2) f(x,y) = sin(xy)

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