Evaluate the following integral using trigonometric substitution. x² dx (225+x²)² What substitution will be the most helpful for evaluating this integral? A. x= 15 sin 0 B. x 15 tan 0 OC. x= 15 sec 0 Rewrite the given integral using this substitution. dx JC de (225+x²)2 (Type an exact answer.) =
