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If ax+by +cz=X,cx+by +az=Y,bx+ay+cz=Z s...

If `ax+by +cz=X,cx+by +az=Y,bx+ay+cz=Z`
show that` (a^2+b^2+c^2-ab-bc-ca)(x^2+y^2+z^2-xy-yz-zx)`
`=X^2+Y^2+Z^2-YZ-ZX-XY`

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