Expand f(x,y) = y^2/x^2

  • Thread starter darkar
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  • #1
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How do u expand f(x,y) = y^2/x^2 about the point (1,-1) ? up to and including quadratic term???
 

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  • #2
Zurtex
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darkar said:
How do u expand f(x,y) = y^2/x^2 about the point (1,-1) ? up to and including quadratic term???
Have you ever used the taylor series on multi-variable functions before?
 
  • #3
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Not really, how? Have only done one variable so far.
 
  • #4
HallsofIvy
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The general term in a Taylor's series for f(x,y) about the point (a,b) is
[tex]\frac{1}{(m+n)!}\frac{\partial^m f}{\partial x^m}\frac{\partial^n f}{\partial y^n}(x- a)^m(y- b)^n[/tex]

(edited. Thanks, daveb)
 
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  • #5
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Shouldn't that (x - b)^n be (y - b)^n?
 
  • #6
Hurkyl
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Bah, everybody likes to do it the hard way. :frown: f(x, y) is just a product of two things whose Taylor series you already know!
 

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