2. We will evaluate V1 - 12 dx in the following steps. (a) Transform the above integral with r = sin 0, draw the triangle. (b) Use sin? 0 = 1 - cos 0 to integrate your result in part (a). 2x2 - 1 3. We will evaluate dr in the following steps. (a) Using an appropriate trigonometric substitution, transform the above integral into sin2 0 cos 0 do. (b) With ordinary u-substitution technique on part (a), show that x2 - 1 1 (12 - 1)3/2 de = + C