I tried to make this as easy to understand as possible. There are 5 questions, anybody remember how to do this stuff?

limx → 0 ( -2 + cos 5x + cos^2 5x − 4 sin 5x ) / (-2x ) =

limx → 0 ( -5 − 2 cos 5x + 7 cos^2 5x − sin 5x ) / (5x^2 − 5x ) =

limx → 0 (3^(2x) - 1) / (x + 3) =

limx → 0+ (1 + x )^(1/(2x)) =

limx → 0 (3^x - 1) / x =

5 questions, I have pretty much forgotten how to do this crap. Any help on any of the five would be greatly appreciated. Thanx