- #1

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[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,