Answer: Verify that each equation is an identity. See
Chapter 5, Problem 62(choose chapter or problem)
Verify that each equation is an identity. See Example 4. sin1x + y2 + sin1x - y2 = 2 sin x cos y
Unfortunately, we don't have that question answered yet. But you can get it answered in just 5 hours by Logging in or Becoming a subscriber.
Becoming a subscriber
Or look for another answer