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The product of the tangents of the perpe...

The product of the tangents of the perpendicular drawn from foci on any tangent to the hyperbola `(x^(2))/(a^(2))-(y^(2))/(b^(2))=1`, is

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The correct Answer is:
`((m^(2)+1)b^(2))/(m^2+1)=b^(2)`
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