# Talk:Trigonometric function

Why does Simple English Wikipedia has "Trigonometric functions" and "Trigonometric function"? Don't the two words mean the same thing? This is located in the Category Tree under Science.Coffsneeze 22:28, 31 March 2007 (UTC)

I took the lemma from en:WP, but I very willing to change to singular. --Cethegus 17:36, 1 April 2007 (UTC)
"Trigonometric function" contents may be copied to the "Trigonometric functions" contents. That way, it is less confusing to the reader. Coffsneeze 22:01, 9 April 2007 (UTC)
That I have already done. But I hesitate to delete the other article because it is older. Maybe you want to change it to a redirect. --Cethegus 22:07, 9 April 2007 (UTC)
If the other article is older, then this article may be copied to the other article. So, this page can be deleted. :) Coffsneeze 19:29, 10 April 2007 (UTC)
I disagree. Trigonometric function also have six functions. Because of this, this page's information can be copied to the other page. Then, this page will be blank. A blank page can be deleted. :) Coffsneeze 20:11, 16 April 2007 (UTC)

## defining individual functions here?

Maybe I am blind or something, but I did not notice a 'simple' definition of the functions, such as:

The cosine function is used to determine the X position of a point, and the sine is used to determine the Y position of a point.

People who need simple content are not looking at the content of this page, they're looking at the picture of a circle with colorful lines. That image, although helpful, is a bit vague.

Also, no scientific notation allowed in the simple wiki!! Are you trying to give someone a headache? For scientific notation, see the actual wikipedia page. — This unsigned comment was added by 24.19.153.13 (talk • changes).

## Identities

I have changed the identities slightly. Can anyone verify that the following is correct?:

${\displaystyle \tan \left(x\pm y\right)={\frac {\tan x\pm \tan y}{1\mp \tan x\tan y}}}$

Or is it:

${\displaystyle \tan \left(x\pm y\right)={\frac {\tan x+\tan y}{1\mp \tan x\tan y}}}$

(without the ${\displaystyle \pm }$ on the top of the right-hand side)?

Cheers! Adamd1008 (talk) 20:38, 14 June 2008 (UTC)

## Math tags

Why is there a white background in some of the mathematics rendering? -- Matt5678 (talk) 07:47, 10 May 2010 (UTC)