   Chapter 11.CR, Problem 31CR Elementary Geometry For College St...

7th Edition
Alexander + 2 others
ISBN: 9781337614085

Solutions

Chapter
Section Elementary Geometry For College St...

7th Edition
Alexander + 2 others
ISBN: 9781337614085
Textbook Problem

If sin ⁡ θ = 7 25 , find cos ⁡ θ and sec ⁡ θ .

To determine

To find:

cosθ and secθ when sinθ=725

Explanation

Calculation:

Given:

sinθ=725

Use the Pythagorean identity,

sin2θ+cos2θ=1

7252+cos2θ=1

49625+cos2θ=1

Add -49625 on both side,

49625+cos2θ+-49625=1+-49625

By the associative property of addition,

49625+-49625

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