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Questions  

The product of the perpendiculars from the foci on any tangent to the hyperbola x264y29=1 is

a
8
b
9
c
16
d
18.

detailed solution

Correct option is B

Equation of a tangent at  (8sec⁡ θ, 3tan⁡ θ) the hyperbola is x8sec⁡ θ−y3tan⁡ θ=1If e is the eccentricity of the hyperbola; product of the perpendiculars=(esec⁡θ−1)(−esec⁡θ−1)sec2⁡θ64+tan2⁡θ9=1−e2sec2⁡θ×(64×9)9sec2⁡θ+64tan2⁡θ=1−64−964sec2⁡θ(64×9)9sec2⁡θ+64tan2⁡θ=64tan2⁡θ+9sec2⁡θ9sec2⁡θ+64tan2⁡θ×9=9.

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Similar Questions

Statement-1: The locus of the point of intersection of the tangents that are at right angles to the hyperbola x236-y216=1 is the circle x2+y2=52

Statement-2: Perpendicular tangents to the hyperbola x2a2-y2b2=1 interest on the director circle  x2+y2=a2-b2a2>b2 of the hyperbola.


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