For $f ( x , y ) = x ^ { 2 } - y ^ { 2 }$ find the tangent plane to the surface defined by f at (1,2).

Name: For $f ( x , y ) = x ^ { 2 } - y ^ { 2 }$ find the tangent plane to the surface defined by f at (1,2).
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The Answer of For $f ( x , y ) = x ^ { 2 } - y ^ { 2 }$ find the tangent plane to the surface defined by f at (1,2).

For f(x,y)=x2−y2f ( x , y ) = x ^ { 2 } - y ^ { 2 }f(x,y)=x2−y2

For $f ( x , y ) = x ^ { 2 } - y ^ { 2 }$