Pls help

-22 Evaluate the integral: -dx x2 Vx2 + 16 (A) Which trig substitution is correct for this integral? Ox = 16 sec(0) Ox = 16 tan(0) Ox = 4 sin(0) Ox = 4tan(0) Ox = - 22 sec(0) Ox = 16 sin(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? +