59. Does knowing that x*y? tan xy 3 ху tell you anything about tan¬ xy lim (х, у) —- (0,0) ху Give reasons for your answer.

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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Question
59. Does knowing that
x*y?
tan xy
3
ху
tell you anything about
tan¬ xy
lim
(х, у) —- (0,0)
ху
Give reasons for your answer.
Transcribed Image Text:59. Does knowing that x*y? tan xy 3 ху tell you anything about tan¬ xy lim (х, у) —- (0,0) ху Give reasons for your answer.
Expert Solution
Step 1

The limit of a function of two variables fx, y is L when x, y approaches to x0, y0 and we denote it

by limx, yx0, y0 fx, y=L. It is defined as for any ε>0, there exists δ>0 such that for all x, yx0, y0

if x, y is in the open disc centred at x0, y0 with radius δ, then fx, y-L<ε.

We have to find the limit of the function tan-1xyxy at the point 0, 0 when it is given that the inequality

1-x2y23<tan-1xyxy<1 holds.

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