Math 231 B, C - Answers for Sep 11 and Sep 14 homework. Fall 2009.

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   #       Date assigned       Date Due       Homework Problems  
7A Fri, 9/11 Thu, 9/17 To do, but not turn in.
3.5: 13 (tan x tan y), 40 (answer is in problem), 69 (h=2)
3.6: 40 ( [x/(1-x^4)][(x^2+1)/(x^2-1)]^(1/4) )
3.9: 12 (1/20Pi cm/min), 16 (0.6 m/s), 27 (6/5Pi ft/min), 33 (107/810 ohms/sec)
7B Mon, 9/14 Thu, 9/17 To do, but not turn in.
3.10: 11a (dy=2x(x cos(2x)+sin(2x))dx), 13b (dy=-[6r^2/(1+r^3)^3]dr), 35a (dS/S = 1/84 =1.2%), 38 (part a: 1.21 cm; part b: dx/x = 3%), 39 (use V=IR to find dV/V = ..., and then set dV=0)