if x+y+z=0 then prove
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xa+yc+zb ,yb+za+xc and zc+xb+ya
=xyz[a b c ]
[c a b ]
[b c a ]
xyz=BCA
=1-1
=0
=xyz[a b c ]
[c a b ]
[b c a ]
xyz=BCA
=1-1
=0
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