最后的几节课。

2022-12-28 22:00:42 +08:00
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--- a/08定积分应用.tex
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 对极坐标方程$\rho = \rho(\theta)$，质量微元的质心坐标为
 \[\dif M_x = \frac{2}{3}\rho(\theta)\sin \theta \dif \theta, \dif M_y = \frac{2}{3} \rho(\theta) \cos \theta \dif \theta\eqper\]
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