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e is an angle in standard position with T(-20, -21) on its terminal ray. Find cose -21/29 -20/29 21/29

Trigonometry (MindTap Course List)

8th Edition

ISBN:9781305652224

Author:Charles P. McKeague, Mark D. Turner

Publisher:Charles P. McKeague, Mark D. Turner

Chapter1: The Six Trigonometric Functions

Section1.2: The Rectangular Coordinate System

Problem 91PS: Draw an angle in standard position whose terminal side contains the point (3, â€“2). Find the...

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Question

e is an angle in standard position with T(-20, -21) on its terminal ray.
Find cose
-21/29
-20/29
21/29

Expert Solution

Step 1

$As x = r \cos (θ) and y = r \sin (θ), then r = \sqrt{x^{2} + y^{2}} and θ = \tan^{- 1} (\frac{y}{x})$

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