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Question

The equation of the hyperbola of given transverse axis whose vertex bisects the distance between the centre and the focus, is given by

A
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B
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C
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D
None of these
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Solution

The correct option is A
Let the equation to the hyperbola be x2a2y2b2=1 …… (i)
Hence, the transverse axis is 2a. If C is the centre, S is the focus and A is the vertex to the hyperbola, then CS = ae
[distance between the centre and the focus]
a=ae2 or e=2
Again, b2=a2(e21)=a2(41)=3a2
On substituting the value of b2 in Equation (i), we get x2a2y23a2=1
3x2y2=3a2

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