Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Could someone please prove this identity

  1. Oct 18, 2006 #1
    tan3A= 3tanA-tan3A/1-3tan^2 A
  2. jcsd
  3. Oct 18, 2006 #2
  4. Oct 18, 2006 #3


    User Avatar
    Science Advisor

    This is the third time that question has been posted in the last few days!
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook