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If tangents OQ and OR are dawn to variable circles having radius r and the centre lying on the rectangular hyperbola xy = 1, then the locus of the circumcentre of triangle OQR is (O being the origin)

A

`xy=4`

B

`4xy=1`

C

`xy=1`

D

none of these

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OBJECTIVE RD SHARMA ENGLISH-HYPERBOLA-Exercise
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  3. P is a point on the hyperbola (x^(2))/(a^(2))-(y^(2))/(b^(2))=1, and N...

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  4. If the tangent at the point (2sec theta,3tan theta) to the hyperbola (...

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  5. The eccentricity of the hyperbola (sqrt(1999))/(3)(x^(2)-y^(2))=1, is

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  6. Tangents are drawn to the hyperbola x^(2)-y^(2)=3 which are parallel ...

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  7. If th tangent at the point (asec alpha, b tanalpha ) to the hyberbola ...

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  8. The equation of the hyperbola of given transverse axis 2a with its ver...

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  9. Find the locus of the midpoints of the chords of the circles x^(2)+y^(...

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  10. If the latus rectum subtends a right angle at the center of the hyp...

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  11. If the latursrectum of a hyperbola through one foucs subtends 60^(@) a...

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  12. If the latus rectum of a hyperbola forms an equilateral triangle with ...

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  13. Let L L ' be the latus rectum through the focus of the hyperbola (x^2)...

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  14. Find the angle between the asymptotes of the hyperbola (x^(2))/(16)-(y...

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  15. Number of integral values of b for which tangent parallel to line y=x+...

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  16. The number of integral points on the hyperbola x^2-y^2= (2000)^2 is (a...

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  17. The relation between Q(3) and P(75) is

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  18. The locus of the centre of a circle which touches two given circles ex...

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  19. If tangents OQ and OR are dawn to variable circles having radius r and...

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  20. about to only mathematics

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