The equations of three lines are given by : \[ 15 x-8 y+1=0,12 x+5 ...

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The equations of three lines are given by :
\[
15 x-8 y+1=0,12 x+5 y-3=0 \text { and } 21 x-y-2=0 \text {. }
\]
Show that the third line bisects the angle between the other two lines.
\( \mathrm{P} \)
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