討論串[理工] [工數]-向量
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因為|r' x r''|=(|r'|^2*|r''|^2*Sin^2)^(1/2). =(|r'|^2*|r''|^2*(1-Cos^2))^(1/2). =[|r'|^2*|r''|^2-|r'|^2*|r''|^2*Cos^2]^(1/2). =[(r'‧r')(r''‧r'')-(r'‧r''
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r' x r''. 曲率 K(t)= ---------. 3. |r'|. 2 1 2. 證明中 K = ----------- [(r'‧r')(r''‧r'')-(r'‧r'') ]. 3 ~~~~~~~~~~~~~~~~~~~~~~~~~~~. (r'‧r') |. |. |. 2 |. |
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The position vector of point A . B and C are given by A = <3,-2,7>. B = <1,2,3> C = <2,4,5>,respectively. Please determine. (a)the quation of theangle
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