4. Use an appropriate half angle identity to find the exact value of cos15°.

Trigonometry (11th Edition)
11th Edition
ISBN:9780134217437
Author:Margaret L. Lial, John Hornsby, David I. Schneider, Callie Daniels
Publisher:Margaret L. Lial, John Hornsby, David I. Schneider, Callie Daniels
Chapter1: Trigonometric Functions
Section: Chapter Questions
Problem 1RE: 1. Give the measures of the complement and the supplement of an angle measuring 35°.
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4. Use an appropriate half angle identity to find the exact value of cos15°.
(0) 56 - JE)
|2+ J3
(d)
(b)
(e) none of these
2
(3^ + 2r); (0)
Transcribed Image Text:4. Use an appropriate half angle identity to find the exact value of cos15°. (0) 56 - JE) |2+ J3 (d) (b) (e) none of these 2 (3^ + 2r); (0)
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