Consider the function f (a) = arctan x+1 x- 1 1. What is lime-1+ f(x) ? What is lim-1-f(x) ? 2. What is lima- f(x) ? What is lim - f(x) ? 3. On what interval(s) is f(x) increasing? On what interval(s) is f(x) decreasing? 4. On what interval(s) is f(x) concave up? On what interval(x) is f(@) concave down