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If alpha and beta are eccentric angles o...

If `alpha and beta` are eccentric angles of the ends of a focal chord of the ellipse `x^2/a^2 + y^2/b^2 =1`, then `tan alpha/2 .tan beta/2` is (A) `(1-e)/(1+e)` (B) `(e+1)/(e-1)` (C) `(e-1)/(e+1)` (D) none of these

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A DAS GUPTA-Ellipse and Hyberbola-EXERCISE
  1. PQ is a chord of the ellipse through the centre. If the square of its ...

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  2. Length of the focal chord of the ellipse x^2/a^2+y^2/b^2= 1 which is ...

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  3. If alpha and beta are eccentric angles of the ends of a focal chord of...

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  4. The hyperbola x^2/a^2 - y^2/a^2 - y^2/b^2 = 1 passes through the point...

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  5. P N is the ordinate of any point P on the hyperbola (x^2)/(a^2)-(y^2)/...

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  6. A triangle has its vertices on a rectangular hyperbola. Prove that the...

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  7. Prove that the product of the perpendicular from the foci on any tange...

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  8. Prove that if any tangent to the ellipse is cut by the tangents at the...

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  9. A tangent to the ellipse x^2+4y^2=4 meets the ellipse x^2+2y^2=6 at P&...

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  10. Find the equations of the tangents from the point (2,2) to the ellipse...

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  11. If the normal at an end of a latus rectaum of an ellipse passes thr...

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  12. The locus of the point of intersection of tangents to the ellipse x^(2...

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  13. If the normal at any point P on the ellipse cuts the major and mirror ...

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  14. Find the locus of the foot of the perpendicular drawn from the cent...

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  15. A variable straight line of slope 4 intersects the hyperbola xy=1 at t...

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  16. Prove that the locus of the middle-points of the chords of the hyperbo...

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  17. A normal to the hyperbola x^2-4y^2=4 meets the x and y axes at A and B...

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  18. A circle cuts two perpendicular lines so that each intercept is of giv...

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  19. A circle with centre (3alpha, 3beta) and of variable radius cuts the ...

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  20. The locus of the point of intersection of the tangents at the end-poin...

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