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  • 三重积分

    book

    August19,2021

    球面坐标系 $$ \begin{cases} x = r\sin\phi\cos\theta \\ y = r\sin\phi\sin\theta \\ z = r\cos\phi \end{cases} $$ ...

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  • 多元函数积分学

    book

    August18,2021

    向量的运算 $$ (a\_x,a\_y,a\_z)\cdot(b\_x,b\_y,b\_z)=a\_xb\_x + a\_yb\_y + a\_zb\_z $$ $$ \bold a \cdot \bold b = |\bold a||...

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