User talk:Husseinshimaljasimdini
Name:hussein.shimal.jasim.dini Location:baghdad-iraq. Specialty:physicist.university of baghdad. http://cid-966d6907c15fe410.spaces.live.com/
![](http://upload.wikimedia.org/wikipedia/commons/thumb/d/dc/Nuvola_apps_important_yellow.svg/48px-Nuvola_apps_important_yellow.svg.png)
Another editor has added the {{
Speedy deletion of Image:MY MATH. IDEAS.pdf
If you think that this notice was placed here in error, you may contest the deletion by adding {{hangon}}
to the top of the page (just below the existing speedy deletion or "db" tag), coupled with adding a note on [[Talk:Image:MY MATH. IDEAS.pdf|the article's talk page]] explaining your position, but be aware that once tagged for speedy deletion, if the article meets the criterion it may be deleted without delay. Please do not remove the speedy deletion tag yourself, but don't hesitate to add information to the article that would would render it more in conformance with Wikipedia's policies and guidelines. Oli Filth(talk) 20:42, 12 February 2008 (UTC)
chain rule
- does always dy\dx=1\(dx\dy)?thank you.Husseinshimaljasimdini (talk) 14:04, 16 April 2008 (UTC)
The proposed identity follows quickly from the chain rule. Suppose y = ƒ(x) and x = g(y). Then
and
Now, since
we have
But
(that's the chain rule). So
(Of course it doesn't work if it involves dividing by 0. At points where dy/dx is 0, dx/dy does not exist since there's a vertical tangent line.) Michael Hardy (talk) 20:22, 21 April 2008 (UTC)