final

# final - Math 31BH - Winter 2011 - Final Exam Name: Student...

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Math 31BH - Winter 2011 - Final Exam Name: Student ID: Instructions: During the test, you may not use books or notes. Read each question carefully, and show all your work. Answers with no explanation will receive no credit, even if they are correct. There are 11 questions which are worth 115 points. You have 180 minutes to complete the test. Question Score Maximum 1 10 2 10 3 8 4 10 5 8 6 10 7 10 8 10 9 8 10 18 11 13 Total 115

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Problem 1. [ 10 points. ] Find the critical points of the function f ( x,y ) = 1 2 x 2 + 3 2 y 2 - xy 3 and determine their nature.
Problem 2. [ 11 points. ] Consider the function f ( x,y ) = y 2 x 4 . (i) [4] Draw the level curves of f . (ii) [3] At the point P (1 , 1), ﬁnd the unit direction of steepest increase for f . (iiii) [4] For the vector ~u = 4 ~ i +3 ~ j 5 , ﬁnd the directional derivative of f at P in the direction ~u , and use it to estimate f ((1 , 1) + . 01 ~u ) .

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Problem 3. [ 8 points. ] Show that the function f : R 2 R 2 given by f ( x,y ) = ( e - x + e 2 y ,e 3 y + e 2 x ) is locally invertible at every point.
Problem 4. [ 10 points.

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## This note was uploaded on 03/28/2011 for the course MATH 31B taught by Professor Dragosoprea during the Winter '11 term at UCSD.

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final - Math 31BH - Winter 2011 - Final Exam Name: Student...

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