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Derivative of a position vector valued function | Multivariable Calculus | Khan Academy https://www.youtube.com/watch?v=E9Q_Lc0g1xE 视频介绍了向量值函数 r(t) = x(t)i + y(t)j,它用于描述二维中的曲线。它解释了这类函数对 t 的导数 r'(t) 是曲线在任一点 t 的瞬时变化率或切线向量,...
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-Stokes example part 1 _ Multivariable Calculus _ Khan Academy 多元微积分,搬运自Khan Academy。 Grant讲解,链接https://www.khanacademy.org/math/multivariable-calculus