Mathematics

Mathematics

Problem

Which of the following definite integrals is improper primarily because one of its limits of integration is infinite? a) ∫−221x2 dx\displaystyle \int_{-2}^{2} \frac{1}{x^{2}}\,dx b) ∫01ln⁡xx dx\displaystyle \int_{0}^{1} \frac{\ln x}{\sqrt{x}}\,dx c) ∫0∞(3x+1) dx\displaystyle \int_{0}^{\infty} (3x+1)\,dx d) ∫0111−x dx\displaystyle \int_{0}^{1} \frac{1}{\sqrt{1-x}}\,dx

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