12. [-/2 Points] DETAILS Consider the following function. SCALCET9 7.3.002. dx 81 - x2 (a) Determine an appropriate trigonometric substitution. T Use x = 9 sin(0), where < 0 < since the integrand contains the expression 92x. 2 2 Use x = 9 tan(0), where T < 0 < -1 since the integrand contains the expression 92 - x. 2 2 T Use x = 9 sec(0), where 0 0 < < 2 3 2 since the integrand contains the expression 92 - x. (b) Apply the substitution to transform the integral into a trigonometric integral. Do not evaluate the integral. X3 x 81 - dx = -S() de Need Help? Read It