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The straight line lx+my+n=0 bisects and ...

The straight line `lx+my+n=0` bisects and angle between the pair of lines of which one is `px+qy+r=0`. Show that the other line is `(l^(2)m^(2))(px+qy+r)=2(lp+mq)(lx+my+n)=0`

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