find dz/dx and dz/dy for the following expression z =  tan-1 [(x+y)/(1-xy)]

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter7: Analytic Trigonometry
Section: Chapter Questions
Problem 78RE
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find dz/dx and dz/dy for the following expression

z =  tan-1 [(x+y)/(1-xy)]

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