Let f(x, y) = (x + 2)? – (y+2)². Fill in the blanks. f(-2, –2) = 0 fa(-2, –2) = fy(-2, –2) = 0 f(x, y) = (x + 2)² – (y+2)² is differentiable at (-2, –2). - not differentiable differentiable

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