In each part, determine whether the integral is proper or improper. If proper, then just write PROPER. If Improper, then write IMPROPER, explain why, and express it in terms of one or more appropriate limits. Do not evaluate the integrals or limits. Part A. cot(x)dx Part B. sec(x)dx Part C. 1 + 9x-2 Part D. -dx 3/4 You must clearly and coherently justify your work - show your steps in your calculation. You cannot provide only the final answer. Circle your final answer for each part