Find, without using tables, the values of Cos x and Sin x, when Cos 2x is : a) 1/8, b) 7/25, c) -119/169

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter7: Analytic Trigonometry
Section7.3: The Addition And Subtraction Formulas
Problem 18E
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6. Find, without using tables, the values of Cos x and Sin x, when Cos 2x is:
a) 1/8, b) 7/25, c) -119/169
3√√7
4 3
(ans. a), F
;b);c)
5' 5
5 12
F
13 13
Transcribed Image Text:6. Find, without using tables, the values of Cos x and Sin x, when Cos 2x is: a) 1/8, b) 7/25, c) -119/169 3√√7 4 3 (ans. a), F ;b);c) 5' 5 5 12 F 13 13
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