- #1

- 5

- 0

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

- Thread starter quantumgenius
- Start date

- #1

- 5

- 0

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

- 5

- 0

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

- #3

Integral

Staff Emeritus

Science Advisor

Gold Member

- 7,201

- 56

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.

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

- 29

- 0

latex is a good tool, im learnign it myself

- #5

HallsofIvy

Science Advisor

Homework Helper

- 41,833

- 961

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?using those formulas, how would you solve

tan 11 pi

-----

8

and cot 195

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

Whatand tan ( pi/4 -x) = 1 - tan x

---------

1 + tan x

thank you so much for any help[/QUOTE]

- Last Post

- Replies
- 15

- Views
- 1K

- Last Post

- Replies
- 2

- Views
- 1K

- Last Post

- Replies
- 3

- Views
- 888

- Replies
- 5

- Views
- 2K

- Replies
- 9

- Views
- 2K

- Replies
- 7

- Views
- 2K

- Replies
- 6

- Views
- 3K

- Last Post

- Replies
- 4

- Views
- 8K

- Last Post

- Replies
- 4

- Views
- 1K

- Last Post

- Replies
- 4

- Views
- 2K