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\vbox{\halign{\bf#\hss\cr Math 225: Calculus III\cr
Quiz 3\quad Feb 8/10, 1994\cr
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1. Describe the level curves of the function
$f(x,y) = \sqrt{ x^2 - y^2 - 4 x + 2y + 54 }$.
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2. Show that the limit
$\lim_{(x,y)\to(0,0)}{\sin(x)\sin(y)\over x^2 + y^2}$
does not exist.

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