2nd derivative? /cry +reppppppppppppp

What are the derivs + 2nd derivs of;

1) y = (cos x) / (1 + sin x)

2) y = x * sqrt of (9-x)

3) y = x^4 - 8x^3 + 18x^2 - 16x + 5

I did them, but my answers are all wonky and I wanna check if they're right please?

[EDIT] never mind; google is a miracle worker.