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\displaystyle [br]\begin{equation*}\frac{1}{2} \times \frac{2}{3} \times \frac{3}{5} \times \frac{5}{7} \times \cdots \times \frac{2k-3}{2k-1}\times \frac{2k-1}{2k+1}\end{equation*}
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\displaystyle [br]\begin{equation*}\frac{1}{2} \times \frac{2}{3} \times \frac{3}{5} \times \frac{5}{7} \times \cdots \times \frac{2k-3}{2k-1}\times \frac{2k-1}{2k+1}\end{equation*}
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