1.

If the curves ax^(2)+by^(2)=1 and a'x^(2)+b'y^(2)=1 are orthogonally then …………

Answer»

`(1)/(a)-(1)/(B)=(1)/(a')-(1)/(b')`
`(1)/(a)+(1)/(b)=(1)/(a')+(1)/(b')`
`(1)/(b)-(1)/(b)=(1)/(a')+(1)/(b')`
`(1)/(a)+(1)/(b)=(1)/(a')-(1)/(b')`

ANSWER :B


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