3. Sketch the graph of a function f whose information is given below: . f is continuous on (-co, co). . lim f(x) = co and lim f(x) =-co X -+-00 x -+ 00 (+) o ( -) o (-) ( -) ? ( -) 0 (+) ?(-) ( - ) ? ( +) ? ( +) -1 5 -1 1 5 -1 5 A sign diagram for f(x) A sign diagram for f'(x) A sign diagram for f"(x)