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Trigonometric formulas for tangent?

  1. Apr 29, 2008 #1
    using those formulas, how would you solve
    tan 11 pi
    -----
    8

    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

    Integral

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    Staff Emeritus
    Science Advisor
    Gold Member

    Please read this thread 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.
     
  5. Apr 29, 2008 #4
    latex is a good tool, im learnign it myself
     
  6. Apr 30, 2008 #5

    HallsofIvy

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    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]
     
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