ABCD is a cyclic quadrilateral.AB and DC when produced meet at P.again AD and BC when produced meet at R.The circumcircles of triangles BCP and CDR intersect at T.prove that P,T,R are collinear.

i have a soloution,but i want to use the Menelaus theorem or some trignometry to prove it. Is it possible to do so???

please HELP!