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: 48


See the steps.

Work Step by Step

$RHS= \dfrac{2 \sec{A}}{\sec{A}-1}$ Multiplying by $\dfrac{\cos{A}}{\cos{A}}$ $RHS = \dfrac{2}{1-\cos{A}} = \dfrac{1}{\sin^2{\dfrac{A}{2}}} = \csc^2{\dfrac{A}{2}} = LHS$
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