I am preparing for a test so please include a brief step by step explanation.

In Exercises 1-8, use graphs and tables to find (a) limx->0. f (x) and (b) lim,->co f (x). (c) Identify all horizontal asymptotes. sin 2x 1. f(x) = cos 2. f(x) = X X ex 3x3 - x + 1 3. f(x) = 4. f( x ) = X x + 3