Applying integration by parts, we get:∫logxdx/(x+1)² = logx∫dx/(x+1)² - ∫{1/x∫dx/(x+1)²}dx= -logx/(x+1) + ∫dx/{x(x+1)}= -logx/(x+1) + ∫(1/x - 1/(x+1))dx= -logx/(x+1) + logx - log(x+1) + C