Trigonometric formulas for tangent?

[quantumgenius]

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

 

[quantumgenius]

the -------------- and what's under that belongs on the right side of the equation

 

[Integral]

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.

 

[tron_2.0]

latex is a good tool, I am learnign it myself

 

[HallsofIvy]

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($\pi/4$) 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($\pi/4$)?


thank you so much for any help[/QUOTE]