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If the chord of contact of tangents drawn from a point `(alpha, beta)` to the circle `x^(2)+y^(2)=a^(2)` subtends a right angle at the centre of the circle, then

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The correct Answer is:
`=>a^(2)-h^(2)+a^(2)-k^(2)=0orh^(2)+k^(2)=2a^(2)`
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