Trigonometry (11th Edition)
Trigonometry (11th Edition)
11th Edition
ISBN: 9780134217437
Author: Margaret L. Lial, John Hornsby, David I. Schneider, Callie Daniels
Publisher: PEARSON
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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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