1. For the integral 1/₂ da x²√x²-9 OA. x = 3 sec (0) OB. x = 3 sec (0) OC. x = 3 sin(0) OD. None of these OE. x = 3 tan (0) the appropriate substitution is ..... and the resulting trigonometric integral is fsec (0) de S cos(0) de Stan (0)de -S de sec(0) tan² (0)

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