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kuing 发表于 2019-3-5 16:00 稍微换一下写法不就好了,比如 \[ \frac{\partial}{\partial y}\left[\frac1{\cos x}\ln\left(\dfrac{\sin\frac{x+y}{2}}{\cos\frac{x-y}{2}}\right)\right]=\dfrac{1}{\sin x+\sin y} \]
青青子衿 发表于 2024-9-5 15:41 这样的怎么办呢? \begin{align*} \left\{
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