81 - Evaluate the integral: (A) Which trig substitution is correct for this integral? Oz = 81 tan(0) Ox = 14 sin(0) %3D Oz = 9 sec(0) O = 81 sec(0) %3D Oz = 9 sin(0) Oz = 9 tan(@) %3D (B) Which integral do you obtain after substituting for a and simplifying? Note: to enter 0, type the word theta. de (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 æ? + C

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