I give up on these three How do you evaluate these using limit properties :*( Help?

(1) lim x-->0 sin 3x / x + x^2 + x^3

(2)lim x-->3 sqrt x^2 + 7 − sqrt x + 13 / sqrt x^3 − 2 − sqrt 2x + 19 (each sqrt covers the entire poly)

(3)lim x-->+infiniti 2x^2 + |x| cosx/ 3x^2 + 5