1.

Maximum value of 'r' such that (e^(2))/(r^(2))=(a^(2))/(sin^(2)theta)+(b^(2))/(cos^(2)theta) where c,a,b are constants is

Answer»

`(C)/(a+B)`
`(c)/(a-b)`
`(a^(2)+b^(2))/(c^(2))`
`(c^(2))/(a^(2)+b^(2))`

ANSWER :A


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