a) Find the first and second derivatives. f'(x) = f"(x) = b) Identify the graph that displays f in blue and f" in red. ? A. 1458 C.. 3.14158 3.1-4156 B..145 D..1458 f(x) = -3 tanx, on (-, ) And use 'U' for the union symbol. Enter DNE if an answer does not exist. f is concave up on f is concave down on 3.1-150 31-4150 c) Using the graphs of f and f", indicate where fis concave up and concave down. Give your answer in the form of an interval. NOTE: When using interval notation in WeBWork, remember that: You use 'INF' for and '-INF' for -.