1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
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: Trigonometric formulas for tangent?

  1. Apr 29, 2008 #1
    using those formulas, how would you solve
    tan 11 pi

    and cot 195

    also, how would you prove tan (x +y ) = tan x
    and tan ( pi/4 -x) = 1 - tan x
    1 + tan x

    thank you so much for any help
  2. jcsd
  3. Apr 29, 2008 #2
    the -------------- and what's under that belongs on the right side of the equation
  4. Apr 29, 2008 #3


    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member

    Please read https://www.physicsforums.com/showthread.php?t=8997" and use LaTex for your equations. This will make it much easier for us to help you.

    Also I am moving this to the homework help forum, in the future please post this type of question there.
    Last edited by a moderator: Apr 23, 2017
  5. Apr 29, 2008 #4
    latex is a good tool, im learnign it myself
  6. Apr 30, 2008 #5


    User Avatar
    Science Advisor

    It's really a very bad idea to mix radians and degrees which it looks like you are doing here. Do you know what tan([itex]\pi/4[/itex]) is? Do you know the "half angle" formula for tangent?

    You wouldn't- it's not true!

    What is tan(x+ y)?? And what is tan([itex]\pi/4[/itex])?

    thank you so much for any help[/QUOTE]
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook