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Use identities to find the exact value for given angle measure. 4 5) sin 0 3T < 0 < 2Tt Find cos(20). %3D - 5'

Use identities to find the exact value for given angle measure. 4 5) sin 0 3T < 0 < 2Tt Find cos(20). %3D - 5'

Algebra & Trigonometry with Analytic Geometry
Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter7: Analytic Trigonometry
Section7.4: Multiple-angle Formulas
Problem 16E
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Use identities to find the exact value for given angle measure. 4 5) sin 0 = - 5' < 0 < 2T Find cos(20).
Transcribed Image Text:Use identities to find the exact value for given angle measure. 4 5) sin 0 = - 5' < 0 < 2T Find cos(20).
Tell whether the statement is true or false, explain! 7) cos 53° = cos 60°cos 7° - sin 60°sin 7° %3D
Transcribed Image Text:Tell whether the statement is true or false, explain! 7) cos 53° = cos 60°cos 7° - sin 60°sin 7° %3D
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