6) Let / be a Poincare line and let P be a point not on 1. Drop a perpendicular from P to 1. Let Q be the foot of this perpendicular. Let A and B be two points on / on opposite sides of Q. Let the 1 hyperbolic distance from P to Q be d. Taking the hyperbolic constant, k, to be equal to 1, prove that the measure of angle APB must be less than 4-arctan arctan(ed).

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
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6) Let / be a Poincare line and let P be a point not on 1. Drop a
perpendicular from P to 7. Let Q be the foot of this perpendicular. Let
A and B be two points on / on opposite sides of Q. Let the
hyperbolic distance from P to Q be d. Taking the hyperbolic constant,
k, to be equal to 1, prove that the measure of angle APB must be less
than 4-arctan(ed).
Transcribed Image Text:6) Let / be a Poincare line and let P be a point not on 1. Drop a perpendicular from P to 7. Let Q be the foot of this perpendicular. Let A and B be two points on / on opposite sides of Q. Let the hyperbolic distance from P to Q be d. Taking the hyperbolic constant, k, to be equal to 1, prove that the measure of angle APB must be less than 4-arctan(ed).
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