2. Evaluate the integral using trigonometric substitution. dx x2 Vx2 _ Use the substitution r = asece and the identity tan2 0 = sec2 0 - 1. a. First, write down your substitutions: T= de =. b. Now plug in your substitutions and integrate with respect to 0. c. Finally, express your answer in terms of r instead of 0. In order to receive full credit, you must draw the triangle and label its sides. Write your final answer here: A correct answer with incorrect preceding steps will receive zero points