1.

If theta is eliminated from the equations a sec theta-x tan theta=y" and "b sec theta+y tan theta=x (a and b are constants), then :

Answer»

the DIRECTOR circle of the hyperbola `(x^2)/(a^2)-(y^2)/(b^2)=1`
auxiliary circle of the ellipse `(x^2)/(a^2)+(y^2)/(b^2)=1`
director circle of the ellipse `(x^2)/(a^2)+(y^2)/(b^2)=1`
director circle of the circle `x^2+y^2=(a^2+b^2)/(2)`

ANSWER :C::D


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