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If agt2abgt0, then the positive value of...

If `agt2abgt0`, then the positive value of m for which `y=mx-bsqrt((1+m^(2)))` is a common tangent to `x^(2)+y^(2)=b^(2) and (x-a)^(2)+y^(2)=b^(2)` is

A

`(2b)/(sqrt(a^2-4b^2))`

B

`(sqrt(a^2-4b^2))/(2b)`

C

`(2b)/(a-2b)`

D

`(b)/(a-2b)` .

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MODERN PUBLICATION-CONIC SECTIONS-EXERCISE
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  2. The area of the parallelogram formed by the lines y=m x ,y=x m+1,y=n x...

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  5. The area bounded by the curves : y=|x-1| and y=1 is :

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  8. A straight line through the origin O meets the parallel lines 4x + 2y ...

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  9. Let P=(-1,0) ,Q =(0,0) and R (3,3sqrt(3)) be three point . The equatio...

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  10. Let 0ltalphalt(pi)/(2) be a fixed angle. If P=(costheta,sintheta)andQ=...

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  11. A triangle with vertices (2, 0), (- 1,- 1),(1,0) is :

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  12. The straight lines 2x+11y - 5 = 0 , 24 x + 7y - 20 = 0 and 4x - 3y - ...

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  13. A straight line through the point (2, 2) intersects the lines sqrt3x +...

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  14. Find the incentre of the triangle with vertices A(1,sqrt3), B(0,0) and...

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  16. Find the area bounded by the ellipse x^(2)/16+y^(2)/9=1

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  17. The equation of the chord joining two points (x1, y1) and (x2, y2) on ...

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  18. A square of side a lies above the X- axis and has one vertex at the or...

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  19. Find the slope of the tangent to the curve y=3x^4−4 at x = 4

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  20. The lines 2x-3y=5 and 3x-4y=7 are the diameters of a circle of area 15...

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