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If a line y-mx bisects the anglebetween ...

If a line `y-mx` bisects the anglebetween the lines `(tan^(2) theta+cos^(2) theta)x^(2)+2xy tan theta -y^(2) sin^(2)theta=0` when `theta` is `60^(@)` then : `sqrt(3)m^(2)+4m=`

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