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exam2_sp07

# exam2_sp07 - Name TA Math 20C Midterm Exam 2 Sec No PID Sec...

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Name: PID: TA: Sec. No: Sec. Time: Math 20C. Midterm Exam 2 May 23, 2007 Turn off and put away your cell phone. You may use any type of handheld calculator; no other devices are allowed on this exam. You may use one page of notes, but no books or other assistance on this exam. Read each question carefully, answer each question completely, and show all of your work. Write your solutions clearly and legibly; no credit will be given for illegible solutions. If any question is not clear, ask for clarification. 1. The tangent plane to a surface z = f ( x,y ) at the point ( - 2 , 3 , 4) has equation 4 x + 2 y + z = 2. Estimate f ( - 2 . 1 , 3 . 1). # Points Score 1 6 2 6 3 6 4 6 5 6 Σ 30

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2. Let f ( x,y ) = x 2 + 6 y 2 . (a) Find the unit vector in the direction for which the directional derivative of

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exam2_sp07 - Name TA Math 20C Midterm Exam 2 Sec No PID Sec...

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