int cos x^(1/2) dx = | x^(1/2) = t; x = t^2; dx = 2t dt | = = int cos t * 2t dt = 2 * int t * cos t dt = 2 * int t d(sin t) = = 2 * t * sin t - 2 * int sin t dt = 2 * t * sin t + 2 * cos t + C = = | t = x^(1/2) | = 2 * x^(1/2) * sin x^(1/2) + 2 * cos x^(1/2) + C