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Equation of pair of lines passing throug...

Equation of pair of lines passing through origin and making an angle `pi/4` with the line `3x + 2y +4 =0` is `(3x +2y)^2-k(2x-3y)^2= 0` then k = (i) `1` (ii) `-1` (iii) `3` (iv) `1/3`

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