Multiple choice Which of the following integrals is unbounded? $\int\limits_0^{\frac{x}{4}}tan\hspace{0.1cm} xdx$ $\int\limits^\infty_0\frac{1}{x^2+1}$ $\int\limits^\infty_0xe^{-x}dx$ $\int\limits^1_0\frac{1}{1-x}dx$ Reveal answer Fill a bubble to check yourself D Correct answer Explanation