AD BE CF=(AB BC CA) (BC/2 CA/2 AB/2)x| |y-2/1|=0比方∠ACB=90°AB比方AD BE CF=(AB BC CA) (BC/2 CA/2 AB/2)
跪求u=u2(x) u2(y) u2(z)y=cosx=sin（x 丌/2)
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