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Algebra: Structure And Method, Book 1
Algebra: Structure And Method, Book 1
(REV)00th Edition
ISBN:9780395977224
Author:Richard G. Brown, Mary P. Dolciani, Robert H. Sorgenfrey, William L. Cole
Publisher:Richard G. Brown, Mary P. Dolciani, Robert H. Sorgenfrey, William L. Cole
Chapter6: Fractions
Section6.1: Simplifying Fractions
Problem 31WE
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Step 1

Let's plug 

Trigonometry homework question answer, step 1, image 1

So,

Trigonometry homework question answer, step 1, image 2

Using trigonometric identity, 

Trigonometry homework question answer, step 1, image 3

Relation becomes,

Trigonometry homework question answer, step 1, image 4

Here, square root can not be negative as r is the radius.

 

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