Let f(æ, y) = x² + 4y² – 5. (1) Find the equation of the plane tangent to this function at (1, 1, 0). (2) Use the linearization (linear approximation) of this function at (1, 1) to approximate f(1.1,0.9). Show all your work and answers on your own paper. You may leave the box below blank.

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