1i hope, there will be no prblem because i posted goiit link here
2 different lines meet a circle |z| =r in the points p , q , r ,s lines are not parrallel . then prove that these lines meet in the point z given by
\frac{p^{-1} + q^{-1} -r^{-1}-s^{-1}}{p^{-1}q^{-1} -r^{-1}s^{-1} } =z
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1http://www.goiit.com/posts/list/algebra-complex-nos-really-a-tough-one-98135.htm#443361