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2Â¥: Originally posted by feixiaolin at 2014-01-02 11:48:43
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3Â¥2014-01-02 15:54:41
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feixiaolin

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3Â¥: Originally posted by Óü-µØÎªÀí-Àæ at 2014-01-02 15:54:41
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ds=dxdy=rdrdtheta
r----------u
theta----v
4Â¥2014-01-02 17:05:22
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oroice

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5Â¥2014-01-02 20:41:06
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Óü-µØÎªÀí-Àæ(feixiaolin´ú·¢): ½ð±Ò+5 2014-01-03 08:24:08
ÏòÁ¿ r = <ucosv, usinv, v>
∂r/∂u = <cosv, sinv, 0>, ∂r/∂v = <-usinv, ucosv, 1>
ÏòÁ¿»ý ∂r/∂u x ∂r/∂v = <sinv, -cosv, u> |∂r/∂u x ∂r/∂v| = ¡Ì(1 + u2)
dS = ¡Ì(1 + u2) du dv
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½ð³æ (СÓÐÃûÆø)

ÒýÓûØÌû:
5Â¥: Originally posted by oroice at 2014-01-02 20:41:06
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