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If e1 is the eccentricity of the conic 9...

If `e_1` is the eccentricity of the conic `9x^2+4y^2=36\ a n d\ e_2` is the eccentricity of the conic `9x^2-4y^2=36` then a. `e_1 ^2-e_2^ 2=2` b. `e_2 ^2-e_1 ^2=2` c. 2< `e_2^2-e_1^2<3` d.`e_1^2-e_2^2>3`

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