Did exact value using half-angle identities  a) sin 22.5° b) cos75°

Mathematics For Machine Technology
8th Edition
ISBN:9781337798310
Author:Peterson, John.
Publisher:Peterson, John.
Chapter67: Analysis Of Trigonometric Functions
Section: Chapter Questions
Problem 1A: If tan A=4.13792 , determine the value of angle A in decimal degrees rounded to the nearest...
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Did exact value using half-angle identities 

a) sin 22.5°

b) cos75°

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