Find all 1st partials of the function z=xy/x^2+y^2

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter9: Systems Of Equations And Inequalities
Section9.10: Partial Fractions
Problem 17E
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Find all 1st partials of the function z=xy/x^2+y^2

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