Consider the integral tan?2 x sec2 x dx. To solve this using methods discussed in this class, let u = [ Select ] and rewrite the integral as [ Select ] where 1. / 2122 (1 - u2) 12 du 1. 2122 (1 + 22) 11 du 111. 2122 (1 + 212) 22 du IV. 2124 (212 - 1) 1 du