i have a test coming up and i wanted to double-check my answers:

1. integral (b = 1, a = 0) x(sqrt (x^2 + 4)) dx

i got 1/8 - 1/4sqrt(5) + c

2. integral (du)/(u(sqrt(5-u^2)))

1/5 ln u/sqrt(5) ln (sqrt(5) + u)/sqrt(5-^2)) + c

3 integral (dt)/(sqrt(t^2 -6t +13))

1/3 arctan (x-3)/2 + c

if someone could tell me if i got these right...it would help me so muchh..thanks