Answer
3
Work Step by Step
Given expression
= 3 $\sin2y$
= 3 $\sin2 (45^{\circ})$
( replacing $ y$ with $ 45^{\circ}$)
= 3 $\sin90^{\circ}$
= 3 $ \times (1)$
( substituting exact value of $\sin 90^{\circ}$)
= 3
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 2 - Section 2.1 - Definition II: Right Triangle Trigonometry - 2.1 Problem Set - Page 63: 50
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