# Integral

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• December 7th 2006, 08:22 AM
ThePerfectHacker
Quote:

Originally Posted by CaptainBlack
try $\tan(u)=x$

RonL

That is exactly what I did.
• December 7th 2006, 08:55 AM
CaptainBlack
Quote:

Originally Posted by ThePerfectHacker
That is exactly what I did.

Some kind of glitch, when I posted I could not see any replies:confused:

In fact a mental glitch, the replies were on the next page:mad:

RonL
• December 7th 2006, 09:14 AM
totalnewbie
$\int\frac{dx}{x\sqrt{x^2-1}}$
using substitution $x=\frac{1}{t}$ in order to find integral

i got that $dx=-\frac{dt}{t^2}$

if i substitute it what should i do with denominator, especially with sqrt ?

oh i hate it. i am going to have a test tomorrow
• December 7th 2006, 03:26 PM
Jameson