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\section{数学}
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\subsection{第一章}
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\subsection{第二章}
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\subsection{一元积分}
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弧长公式:$\int_a^b\sqrt{1+y'}\,\textrm{d}x=\int_\alpha^\beta\sqrt{x'^2+y'^2}\,\textrm{d}t=\int_{\theta_1}^{\theta_2}\sqrt{r^2+r'^2}\,\textrm{d}t$。
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旋转体积公式:
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形心公式:
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极限定积分公式:
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\subsection{行列式}
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\subsection{矩阵}
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