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Locus of the middle points of the secant...

Locus of the middle points of the secants drawn through the point `(x_(1),y_(1))` and intercepted by the circle `x^(2)+y^(2) =a^(2)` is ………..

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The correct Answer is:
`x^(2)+y^(2)-x x_(1)-y y_(1)=0`
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