Math Help - Paramateric Differentiation

Soz i posted in wrong section 1st time don't wanna upload attatchments again so heres link...

http://www.mathhelpforum.com/math-he...tion-help.html

What do you mean exactly? Did you post this problem already?

If you make a thread in the wrong section, what you should do is not make a duplicate thread in another section. You should report the thread by clicking the triangle in the upper right-hand corner of every post and explain what happened. This will alert the staff of what happened and someone will move it for you. If you make a duplicate thread/post you will probably be infracted.