Multiple choice

Which of the following integrals is unbounded?

  1. $\int\limits_0^{\frac{x}{4}}tan\hspace{0.1cm} xdx$
  2. $\int\limits^\infty_0\frac{1}{x^2+1}$
  3. $\int\limits^\infty_0xe^{-x}dx$
  4. $\int\limits^1_0\frac{1}{1-x}dx$
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D Correct answer
Explanation

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