The difference of the focal distances of any point on the hyperbola is equal to

The eccentricity of the hyperbola whose latus-rectum is half of its transverse axis, is

The eccentricity of the hyperbola x² – 4y² = 1 is

the foci of the hyperbola 9x² – 16y² = 144 are

The distance between the foci of a hyperbola is 16 and its eccentricity is , then equation of the hyperbola is