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mathdeptv2/工具v2/文本文件/metadata.txt

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$[-\dfrac{\pi}{12}+k\pi,\dfrac{5\pi}{12}+k\pi]$, $k\in \mathbf{Z}$
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$[0,\dfrac{\pi}{8}]$和$[\dfrac{5\pi}{8},\pi]$
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(1) 当$k\in (-\infty,-1)\cup (\sqrt{2},+\infty)$时, 无解; 当$k\in [-1,1)\cup \{\sqrt{2}\}$时, 一解; 当$k\in [1,\sqrt{2})$时, 两解;\\
(2) 当$k\in (-\infty,-1)\cup (\dfrac{5}{4},+\infty)$时, 无解; 当$k=\dfrac{5}{4}$时, 两解; 当$k=1$时, 三解; 当$k\in (1,\dfrac{5}{4})$时, 四解