## anonymous 5 years ago Please help me solve: Integral of dy / [ sqrt(y^2 + 4y) ]

1. anonymous

I know I have to use trig substitution. But I dunno with this one

2. anonymous

im stuck on this one as well you can complete the square to get (y+2)^2 - 4 but thats of the form 1/sqrt(x^2 - 1) which there is no trig substitution to help us try factoring out a negative but then its still in square root sorry ??

3. anonymous

I get it. I used $\sec \theta$