If z = tan a 2 , show that cos a = 1 - z2 1 + z2 .
Chapter 7, Problem 106(choose chapter or problem)
If z = tan a 2 , show that cos a = 1 - z2 1 + z2 .
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