In Exercises 9799, prove that the equations are
Chapter 8, Problem 98(choose chapter or problem)
In Exercises 9799, prove that the equations are identities. (These identities appear in Trigonometry and Double Algebra, by August DeMorgan, published in 1849.)sin 2u tan145 u2 tan145 u2tan145 u2 tan145 u2sin
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