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Quiz 6\quad Mar. 1/3, 1994\cr
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1. Find the absolute maximum of the function
$f(x,y) = x^2 - 2 x y^2 - 4 y$
on the rectangle $-2 \le x \le 2$, $-2 \le y \le 2$.	
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2. Find the extreme values of the function $f(x,y) = x^3 y$ subject
to the constraint \hbox{$x^2 + 4y^2 = 1$}.

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