Answer
03/21/15.
Work Step by Step
It is better to have a good mood when meeting with an online friend for the first time. We need to find a maximum on the emotional curve in March, which happens on 03/21/15.
Precalculus (6th Edition) Blitzer
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13446-914-3
ISBN 13:
978-0-13446-914-0
Chapter 4 - Section 4.5 - Graphs of Sine and Cosine Functions - Exercise Set - Page 597: 79
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