△ABC is a triangle with AB<BC,Γ its circumcircle, K the midpoint of the minor arc CA of the circle C and T a point on Γ such that KT is perpendicular to BC. If A′,B′ are the intouch points of the incircle of △ABC with the sides BC,AC, prove that the lines AT,BK,A′B′ are concurrent. geometrycircumcircleconcurrencyconcurrentincircle