57 and 60(the last one)
I think the answer is 2 (B)
I think the answer for 57 is 7(B)
Yes, how? Pls send solutions
For 2(B), eliminate t, u will get eqn of hyperbola, then calculate eccentricity
For 57, use ae=AE , condition for equal focus, u will get value eccentricity of ellipse, use that e to calculate b^2 .