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cbrt()、cbrtf()、cbrtl() - 立方根の計算
https://www.ibm.com/docs/ja/zos/2.3.0?topic=functions-cbrt-cbrtf-cbrtl-calculate-cube-root
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cbrt(3) - Linux manual page
https://www.man7.org/linux/man-pages/man3/cbrt.3.html