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3. Let f (x) = In(1 + x2). Then f' (x) = 2x 1+xz and f" (x) = 4 2-2x2 (1+x2)z. Use this information to find the domain, intervals of increase/decrease, local maximum/minimum values, intervals of concavity, and points of inflection on the graph of y = f(x). Do not graph the function. You must show your work for credit. If any of these characteristics don't exist, write "DNE". Write your answers in the space provided. Domain: Increasing on: Decreasing on: Local Maxima: Local Minima: Concave up on: Concave down on: Point(s) of inflection: 4. Use L'Hospital's rule to evaluate limx-+2 (x2-4 - -z). You must first verify that L'Hospital's rule applies (is this an indeterminate form?). You will not receive credit for evaluating the limit using any technique other than L'Hospital's rule