-21 Evaluate the integral: rV + 81 (A) Which trig substitution is correct for this integral? Or = 9 tan(0) Ox = 81 sec(0) Or = 81 tan(0) %3D Ox = 9 sin(0) %3D Ox = 81 sin(0) %3D Or = - 21 sec(0) %3D (B) Which integral do you obtain after substituting for r and simplifying? Note: to enter 0, type the word theta. do (C) What is the value of the above integral in terms of 0? + C (D) What is the value of the original integral in terms of x? + C

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