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Calculus Level 4

If

\[\large a_n=\int_{0}^{{\pi}/ {2}} (1-\sin{x})^n \sin{2x} \, dx\]

, then

\[\large \lim_{m\to\infty} \sum_{n=1}^{m} \frac{a_n}{n}\]

equals?

None of these choices \[\frac{3}{2}\] \[\frac{1}{2}\] \[\frac{4}{3}\] \[1\]

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by Navdeep Kaswan

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