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Quiz 5\quad Feb. 22/24, 1994\cr
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1. Find the equation of the plane tangent to the graph of
$f(x,y) = x^3 y - y^2$ at the point $(1,1,0)$.	

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2. Find the local maxima, local minima, and saddle points of the
graph of the function
$f(x,y) = {1\over2}x^2 y^2 - x y^2 - 2x^2 + 4x + 1$.
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