Hey guys, I'm having touble inegrating:

(cosh[3t]^5)(sinh[3t]^4)

I've tried a number of things, integration by parts, using the identities and double angle formulae, substitution and a bunch of combinations of the above but cannot get the result given by The Integrator--Integrals from Mathematica which gives a hideous looking beast of an answer.

and i also can't do:

(u+3)/([u^2]+4u+8)

I believe I need to complete the square and then use a trigonometric substitution but can't figure it out, or maybe I'm getting lazy. Insight please?

Would appreciate any help.. thanks guys.

Aleks