Let z = r+iy, r, y E R. Show that if cos a = 0, then cosh y cosh y 1 <1. | cot 2|2 :

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter7: Analytic Trigonometry
Section7.4: Multiple-angle Formulas
Problem 54E
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Let z = x + iy, r, y E R. Show that if cos r =
0, then
%3D
| cot 2|2
cosh y – 1
<1.
cosh y
Transcribed Image Text:Let z = x + iy, r, y E R. Show that if cos r = 0, then %3D | cot 2|2 cosh y – 1 <1. cosh y
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