" Let "S={(x,y)in R^(2):(y^(2))/(1+r)-(x^(2))/(1-r)=1}," where "r!=+-1." Then S represents: "

Let S={(x,y) in R^(2):(y^(2))/(1+r)-(x^(2))/(1-r)=1} , where r ne pm 1 . Then S represents:

Let S={(x,y) in R^(2):(y^(2))/(1+r)-(x^(2))/(1-r)=1} , where r ne pm 1 . Then S represents:

Let S={(x,y) in R^(2):(y^(2))/(1+r)-(x^(2))/(1-r)=1} , where r ne pm 1 . Then S represents:

Let S={(x,y) in R^(2):(y^(2))/(1+r)-(x^(2))/(1-r)=1} , where r ne pm 1 . Then S represents:

Let P={(x,y)//x in R, y in R, x^(2)+y^(2)=1} , then P is

The equation (x^(2))/(1-r)+(y^(2))/(r-3)+1=0 represents an ellipse if :

The equation (x^(2))/(1-r)-(y^(2))/(1+r)=1,r>1 represents (a)an ellipse (b) a hyperbola (c)a circle (d) none of these

Let R={(x,y):x^(2)+y^(2)=1,x,y in R} be a relation in R. Then the relation R is

(x^(2))/(r^(2)-r-6)+(y^(2))/(r^(2)-6r+5)=1 will represent ellipse if r lies in the interval