■葉序らせん(その33)
ここで座標変換を行いたい.
A(−s/2,−√3/5,c/2)
B(s/2,−√3/5,c/2)
C(0,3√3/10,0)
D(c√(2/3),−√3/30,s√(2/3))
E(−c√(2/3),−√3/30,s√(2/3))
F(αc−γs,β−y,αs+γc)
G(ξc−ζs,η−y,ξs+ζc)
O(0,0,0)
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cos(∠AOB)=(−s2/4+3/25+c^2/4)/{1/4+3/25)
s^2=3/5,c^2=2/5を代入すると
cos(∠AOB)=(−3/20+3/25+2/20)/(1/4+3/25)
=7/37
cos(∠DOE)=(−2c^2/3+1/300+2s^2/3)/(2/3+1/300)
=(−4/15+1/300+6/15)/(2/3+1/300)
=41/201
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