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A) Find the equations of the tangent plane and normal line to the graph of f(x,...

A) Find the equations of the tangent plane and normal line to the graph of f(x, y) =(x/1+x2y) (1, 2).

B)Evaluate the limit or explain why it does not exist .

lim(x,y)→(0,0) (2x2+5y)2/x4+4y2

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