Question: f(x,y) is a piecewise function where f ( x , y ) = x + y + 1 x 2 when (x,y) does NOT equal

f(x,y) is a piecewise function where

f(x,y)=x+y+1x2 when (x,y) does NOT equal (0,-1)

f(x,y)=0 when (x,y) = (0,-1)

How can I get the equation of the tangent plane to f at (x,y) = (1,2)?

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