Hw due in 20 minutes. Please help.

(24V 202 - 81 Evaluate the integral dx (A) Which trig substitution is correct for this integral? Ox - 81 tan(0) Ox = 81 sec(0) Ox = 24 sin(0) Ox - 9 sin(0) Ox = 9 sec(0) Ox = 9tan(0) (B) Which integral do you obtain after substituting for a and simplifying? Note: to enter 0, type the word theta. (C) What is the value of the above integral in terms of 0? + (D) What is the value of the original integral in terms of a? +