Evaluate the following integral using trigonometric substitution. 7x² dx (121+x²)² S What substitution will be the most helpful for evaluating this integral? OA. x= 11 tan 0 B. x = 11 sin 0 OC. x= 11 sec 0 Rewrite the given integral using this substitution. 7x² dx (121+x²)² = √ - 1000 S de (Type an exact answer.)

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