1.

If the chords of contacts of the tangents from the points (x y,) and (x_(2), y_(2)) to the hyperbola 2x^(2) - 3y^(2) = 6 are at right angle, then 4x_(1)x_(2) + 9y_(1)y_(2) is equal to

Answer»

`-1`
0
6
`-12`

ANSWER :B


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