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Update higherMathematics.md
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870138612 authored Dec 21, 2024
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Expand Up @@ -513,7 +513,7 @@ $$
V=2\pi\int\int d dxdy.
$$
$$
d=\frac{|Ax+By+C|}{\sqrt{A_2+B_2}}.
d=\frac{|Ax+By+C|}{\sqrt{A^2+B^2}}.
$$

- 古尔金定理:旋转体的体积等于截面积乘以截面积的形心绕直线旋转得到的周长,$d$是形心到直线的距离,$s$是截面积.
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