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The combined equation of the lines l1a n...

The combined equation of the lines `l_1a n dl_2` is `2x^2+6x y+y^2=0` and that of the lines `m_1a n dm_2` is `4x^2+18 x y+y^2=0` . If the angle between `l_1` and `m_2` is `alpha` then the angle between `l_2a n dm_1` will be

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