Solve this:
APxBP=DPxCP[property of intersecting chords]
butAP=CP=x
therefore BP=DP=y
but AB=AP+BP
=x+y
and CD = CP+DP
= x+y
Therefore LHS=RHS
Hence Proved
butAP=CP=x
therefore BP=DP=y
but AB=AP+BP
=x+y
and CD = CP+DP
= x+y
Therefore LHS=RHS
Hence Proved