Consider the function below. (If an answer does not exist, enter DNE.)f(x) = ex + e-x(a) Find the interval(s) on which f is increasing. (Enter

Consider the function below. (If an answer does not exist, enter DNE.)f(x) = e²x + e-x(a) Find the interval(s) on which f is increasing. (Enter your answer using interval notation.)Find the interval(s) on which fis decreasing. (Enter your answer using interval notation.)(b) Find the relative minimum value(s) of f. (Enter your answers as a comma-separated list.)(c) Find the interval(s) on which fis concave up. (Enter your answer using interval notation.)