Evaluate the integral: 21/x² 100 dx x4 (A) Which trig substitution is correct for this integral? 10 sin(0) x = x = 10 sec(0) x = 100 sec(0) x = 21 sin(0) x = 10 tan(0) x = 100 tan(0) (B) Which integral do you obtain after substituting for x 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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