5. Consider the definite integral fox tan(x) dx. a. Explain why this integral cannot be evaluated exactly by using either u- substitution or by integrating by parts. b. Using appropriate subintervals, compute L4, R4, M4, T4, and S8. c. Which of the approximations in (b) is an over-estimate to the true value o So x tan(x) dx? Which is an under-estimate? How do you know?