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A multivariate calculus function?
Q. f(x,y) = (sin(x)sin(y))/xy what is the second partial derivative of this function. I want only the second partial derivative w.r.t x, differentiate w.r.t x first.
Asked by joker - Sat Sep 2 14:26:45 2006 - - 3 Answers - 0 Comments

A. Let df/dx and d^2f/x^2 denote the first and second partials with respect to x of f(x,y) When we take partials of f with respect to x we hold all terms in y constant df/dx = [sin(y)/y][(x cos(x) - sin(x))/x^2] = [sin(y)/y][cos(x)/x - sin(x)/x^2] Now we compute the first partials of cos(x)/x and sin(x)/x^2 d/dx cos(x)/x = [-x sin(x) - cos(x)]/x^2 d/dx sin(x)/x^2 = [x^2 cos(x) - 2x sin(x)]/x^4 Now we compute d^2f/dx^2 d^2f/dx^2 = [sin(y)/y]d/dx[cos(x)/x - sin(x)/x^2] = [sin(y)/y][ d/dx cos(x)/x - d/dx sin(x)/x^2] Now substitute for the partials in the second pair of brackets and simplify
Answered by MathMaven53 - Sat Sep 2 15:04:48 2006

What courses should I continue to take in High School to become a Doctor?
Q. right now i am a sophomore and taking those current classes and must schedule for my remaining years in highschool. I would also like to get into Princeton University or some ivy league, or John Hopkins University. And i know Junior year is the most important when applying to college so i have to take the right classes lol I am hoping being an African American male and this smart will help as well Freshmen- gpa 2.71 i was goofing around a lot lol but I am focused now English 9 GT Biology GT Algebra 2 GT US History GT Art Health/Lifetime Fitness Spanish 1 Sophomore - Current Classes and 1st quarter 3.7 and 2nd Quarter 3.6 Chemistry GT A A English 10 GT B B Pre-Calc GT B B Gov Honors A B Spanish 2 Honors A A Band A A Food and Nutrition… [cont.]
Asked by boy - Thu Jan 8 15:40:07 2009 - - 2 Answers - 0 Comments

A. Honey -- Med schools dont give a flip what you did in high school. Your job in high school is to get into the best college that fits your goals and personality. In college, THEN you work your butt off in science-oriented classes, make great grades, do well on the MCAT, and THEN medical schools will look at you. They will NOT look at your high school transcript! Stop goofing off, kiddo. No more Bs, ok? A 3.1 or 3.2 isn't going to impress any of the schools you mentioned, no matter your race. Settle down and get to work. Your As are in fluff classes -- start getting As in the sciences and maths. And take the most challenging courses available to you -- culinary arts is b.s., and you're using it for a study hall. Where are the… [cont.]
Answered by MamaBear - Thu Jan 8 15:54:17 2009

General College Help: Lecture, Homework, and Test Issues?
Q. 1) Lecture Issues I go to lecture for any class, and nothing seems to be absorbed. I get my full night s rest, drink coffee the morning of, go to lecture, and listen to the whole thing while taking notes, only to leave going Wait, what the heck did I just learn? It s not just for my math and science courses but for my easier courses as well. Up until this point I have been learning from the book (which has many limitations), but I can only learn so much the first time through. Lecture has a purpose, and these teachers don t spend hours preparing notes for the students to just so the students can stare at the teachers going huh? . I understand that there some teachers are better than others, but still the problem is me overall. I even… [cont.]
Asked by collegestudent1212 - Sun Nov 9 00:26:02 2008 - - 1 Answers - 0 Comments

A. Have you tried talking to the professor about any of these topics? He/She may be able to recommend studying techniques, ways to problem solve, and exam advice. I know at my university there is a department that works with people that may need help in areas, such as needing more time for exams. You could try looking into this at your university. Another thing is to go over previous work that you've done in the class, noting where you went wrong and why you thought to take that route. Even writing in the margins as you go on about what you are trying to do with the equation may help you stay on track. Regarding the time of the exams, I recommend not looking at the clock and going as quickly as you can. You could start by laying a… [cont.]
Answered by Kc - Sun Nov 9 00:40:56 2008