Trig. sub. will do it, but I'm afraid that your first sub. won't work.
Or make
You can tackle the first one via trig. - hyperbolic substitution or integration by parts, the another one is a classic one.
hehe, i figure there might have been a problem with the first substitution, but i was too lazy to check. that's why i also put the trig sub there (i hoped to avoid trig sub altogether--you're rubbing off on me )