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\leftline{Mathematics 241 -- Multivariable Calculus}
\leftline{Quiz 5 -- October 11, 2013}
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\leftline{Your Name: $\underline{\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ }$}
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Let $f(x,y) = e^y \cos(x + y^2)$ for both parts below.  
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A) (10) Compute ${\partial f\over \partial x}(x,y)$ and ${\partial f\over \partial y}(x,y)$.
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B) (10) Find the directional derivative $D_{(\sqrt{3}/2,-1/2)} f(\pi/2,0)$.
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