1.

If the line lx+my=1 is a normal to the hyperbola x^(2)/a^(2)-y^(2)/b^(2)=1" then "a^(2)/l^(2) -b^(2)/m^(2) is equal to

Answer»

`a^(2)-B^(2)`
`a^(2)+b^(2)`
`(a^(2)+b^(2))^(2)`
`(a^(2)-b^(2))^(2)`

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