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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

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

Advanced Engineering Mathematics
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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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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