Latest threads

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• $C(\theta) =\prod_{k=1}^\infty\sin(\theta/2^k)/(\theta/2^k)$
• 无穷乘积求值
• $\abs{\bm a}=\abs{\bm a+3\bm b}=2$ ，求 $\abs{\bm a+\bm b}+\abs{\bm b}$ 最大值