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[函数] 比大小

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guanmo1 Posted at 2023-2-28 14:45:15 |Read mode
Last edited by hbghlyj at 2025-3-19 08:23:26$\sin ^2 0.1$ 与 $\sin 0.1^2$, 比较大小。

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kuing Posted at 2023-2-28 15:51:20
x 很小时 `\sin x\approx x-x^3/6`
平方得 `\sin^2x\approx x^2-x^4/3`
以及 `\sin(x^2)\approx x^2-x^6/6`
所以前者小。

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hbghlyj Posted at 2023-2-28 19:49:17

手机版Mobile version|Leisure Math Forum

2025-4-21 01:15 GMT+8

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