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Quiz, Sep 18

Name:

Continuity (5pts). Show that the function x+y√x2+y2

is not continuous at the origin. (One way to do this is

to take limits along x = y and x = −y.)

Tangent Plane (8 pts). Find the equation for the tangent plane to f(x, y) = xy at the point (1, 1, 1).

1

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Contour Plots. Consider the function of 2 variables whose contour graph is drawn below.

• 4 Points: Mark all local maximum, minima, or saddle points of f on the contour plot.• 3 Points: Write the equation of the tangent plane at the point (−1, 1, 1).

Bonus Problem. Worth no points! Consider the piecewise defined function

f(x, y) =

{0 Whenever x 6= y2 or x = y = 01 Whenever x = y2 and x 6= y 6= 0.

Show that this function is continuous along every line approaching the origin. Also show that this funcitonis not continuous.

2

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