Trigonometry 7th Edition

Published by Cengage Learning
ISBN 10: 1111826854
ISBN 13: 978-1-11182-685-7

Chapter 5 - Section 5.4 - Half-Angle Formulas - 5.4 Problem Set - Page 305: 42



Work Step by Step

$\cos{\dfrac{A}{2}} = \sqrt{\dfrac{1+\cos{A}}{2}}$ $\cos{75} = \sqrt{\dfrac{1+\cos{150}}{2}} = \sqrt{\dfrac{1-\dfrac{\sqrt{3}}{2}}{2}}$ $\cos{75} = \dfrac{\sqrt{2-\sqrt{3}}}{2}$
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