Evaluate the integral: (V81 -13 -dr (A) Which trig substitution is correct for this integral? Or - 9tan(0) Oz = 81 sec(0) Or - 81 tan(0) Or = 81 sin(0) Or - 9 sin(0) Or = 9 sec(0) (B) Which integral do you obtain after substituting for I and simplifying? Note: to enter 0, type the word theta. cot ( 0) C) What is the value of the above integral in terms of ? (-cot (0) -0) C D) What is the value of the original integral in terms of z? VI- ST sin X + C syntax error. Question Help: ) Video