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Unformatted text preview: MATH 23 Sample Second Exam was: April, 2003 NAME : Section (Last, First) 1. (10 points ) Sketch the level curves corresponding to the values -1, 0 and 2 for the function f ( x, y ) = y- 4 x 2 . 2. (10 points ) Let f ( x, y ) = ye xy . Find each of the following. (a) f x (b) f y (c) f y (0 , 2) 3. (10 points ) Find an equation of the tangent plane to the surface z = x 2- 3 y 2 at the point (- 3 , 2 ,- 3) . 4. (15 points ) Let f be the function f ( x, y ) = cos(2 xy ) . (a) Find the directional derivative of f at the point (2 , 8 ) in the direction of the vector a = <- 1 , 3 > =- i + 3 j. (b) Find the maximal rate of change of f at the point (2 , 8 ) and the direction in which it occurs. 5. (15 points ) The function h ( x, y ) = xy- x 2- y 2 + 3 y + 1 has only one critical point. Find the critical point and determine whether h has a local maximum, local minimum or saddle point. Give the value....
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