The distance between the directrices of the hyperbola `x=8s e ctheta,\ y=8\ t a ntheta,` a.`8sqrt(2)` b. `16sqrt(2)` c. `4sqrt(2)` d. `6sqrt(2)`

Write the distance between the directrices of the hyperbola x=8s e ctheta,\ y=8t a nthetadot

The distance between the directrices of the hyperbola x=8sec theta,y=8tan theta,8sqrt(2)b16sqrt(2)c.4sqrt(2)d.6sqrt(2)

The distance between the directrices of the hyperbola x^(2)-y^(2)=9 is a) 9/(sqrt(2)) b) 5/(sqrt(3)) c) 3/(sqrt(2)) d) 3sqrt(2)

The eccentricity of the hyperbola x=a/2(t+1/t), y=a/2(t-1/t) is a. sqrt(2) . b. sqrt(3) c. 2sqrt(3) d. 3sqrt(2)

The distance between the directrices of the ellipse (4x-8)^(2)+16y^(2)=(x+sqrt(3y)+10)^(2) is k,then (k)/(2) is

In an ellipse the distance between the foci is 8 and the distance between the directrices is 25. The length of major axis is : (A) 5sqrt(2) (B) 10sqrt(2) (C) 20sqrt(2) (D) none of these

In an ellipse the distance between the foci is 8 and the distance between the directrices is 25. The length of major axis is : (A) 5sqrt(2) (B) 10sqrt(2) (C) 20sqrt(2) (D) none of these

(2sqrt8)/(sqrt6-sqrt2)=

Tangents are drawn to x^(2)+y^(2)=16 from the point P(0,h). These tangents meet the x- axis at A and B. If the area of triangle PAB is minimum,then h=12sqrt(2) (b) h=6sqrt(2)h=8sqrt(2) (d) h=4sqrt(2)

The eccentricity of the hyperbola 4x^(2) - y^(2) - 8x - 8y - 28 =0 is a)3 b) sqrt5 c) 2 d) sqrt7