三向量AB、BC、CA构成ABC,AB BC CA=0an=2a(n-1) (n 2)/【n(n 1)】(n≥2,n∈n*)比如BE=BC CE=BC CA/2；CF=CA AF=CA AB/2比如三向量AB、BC、CA构成ABC,AB BC CA=0
求u=u2(x) u2(y) u2(z)y=cosx=sin（x 丌/2)
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