Answer
See the steps.
Work Step by Step
$LHS = \cos{(60)} = \dfrac{1}{2}$
$RHS = 1-2 \sin^2 {30} = 1-2\left(\dfrac{1}{2}\right)^2 = \dfrac{1}{2}$
$LHS = RHS$
Trigonometry 7th Edition
by McKeague, Charles P.; Turner, Mark D.
Published by
Cengage Learning
ISBN 10:
1111826854
ISBN 13:
978-1-11182-685-7
Chapter 5 - Section 5.3 - Double-Angle Formulas - 5.3 Problem Set - Page 297: 30
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