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Trigonometric formulas for tangent?

  • #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
 

Answers and Replies

  • #2
the -------------- and what's under that belongs on the right side of the equation
 
  • #3
Integral
Staff Emeritus
Science Advisor
Gold Member
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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:
  • #4
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latex is a good tool, im learnign it myself
 
  • #5
HallsofIvy
Science Advisor
Homework Helper
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using those formulas, how would you solve
tan 11 pi
-----
8

and cot 195
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?

also, how would you prove tan (x +y ) = tan x
You wouldn't- it's not true!

and tan ( pi/4 -x) = 1 - tan x
---------
1 + tan x
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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