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If A, B, C, be the centres of three co-a...

If A, B, C, be the centres of three co-axial circles and `t_(1),t_(2),t_(3)` be the lengths of the tangents of them any piont, prove that
`bar(BC).t_(1)^(2)+bar(CA).t_(2)^(2)+bar(AB).t_(3)^(2)=0`

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