In the following exercises, find the antiderivative using the indicated substitution. 261. ./(x. (x + 1) dx; u = x+1 262. [(x - 1)³ 1)5dx; u = x - 1 263. ./ (2x - (2x - 3)-7dx; u = 2x - 3 264. (3x-2 (3x - 2)-¹¹ dx; u = 3x - 2 X 265. =dx; u = x² + 1 x² + 1 X 266. =dx; u = 1 - x² √1-x² 267. [(x - 1) (x² - 2x)³dx; u = x² − 2x 268. /(x (x² − 2x) (x³ − 3x²)² dx; u = x³− 3x² - cos de 269 J = sine