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Q.

If the eccentricity of the ellipse x2log a2+y2log b2=1 a>b>0, a, b1 is 12and 'e' be the eccentricity of the hyperbola x2logba2-y2=1, then e2 is greater than (where log x=ln x)

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a

23

b

54

c

12

d

32

answer is B, C, D.

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Detailed Solution

Eccentricity  of ellipsse x2log a2+y2log b2=1 a>b>0, a, b1 is 12

1-logb2loga2=12

log b2=log a21-12 logba2=2 Eccentricity of hyperbola e=1+1logba2 e2=1+logab2=1+12=32

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If the eccentricity of the ellipse x2log a2+y2log b2=1 a>b>0, a, b≠1 is 12and 'e' be the eccentricity of the hyperbola x2logba2-y2=1, then e2 is greater than (where log x=ln x)