- #1

WalkingInMud

- 5

- 0

[tex]\int\sqrt{[1-sech(u)]^{2}+ [-tanh(u)sech(u)]^{2}}du[/tex]

We have a [tex]sech(u)[/tex] and its derivative [tex]-tanh(u)sech(u)[/tex] and this suggests some sort of substitution maybe, but the radical makes it a bit nasty for Me.

Any Ideas? ...Thanks Heaps,