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Q.

The equation x-22+y-12-x+22+y2=c will represent a hyperbola if

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a

c(0, 17 )

b

c∈(0, 6) 

c

cR

d

c∈(0, 5)

answer is C.

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Detailed Solution

Given x-22+y-12 - x+22+y2=c It is in the form of SP-S1P=2a where foci are S=(2, 1), S1=(-2, 0), P=(x, y) and 2a=c we know that SS1>2a  e>12ae2a>1SS12a>1                 17 > c                 c< 17 So, c lies between 0 and d17 c(0, 17) 

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