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The product of the perpendicular from th...

The product of the perpendicular from the 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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