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## Main Question or Discussion Point

Hi all,

I've been studying calculus out of Tom Apostol's book "Calculus". I'm having troube with the following problem in the section on integration by substitution:

Integrate [tex]\int(x^2+1)^{-3/2}\,dx[/tex].

I tried the substitution [tex]u=x^2+1[/tex] but it didn't seem to work. I can't see anything else that may help. Any hints or solution would be greatly appreciated!

I've been studying calculus out of Tom Apostol's book "Calculus". I'm having troube with the following problem in the section on integration by substitution:

Integrate [tex]\int(x^2+1)^{-3/2}\,dx[/tex].

I tried the substitution [tex]u=x^2+1[/tex] but it didn't seem to work. I can't see anything else that may help. Any hints or solution would be greatly appreciated!