Problem #WSP-000172

Problem

Point \(A\) is the centre of a circle. Points \(B,C,D,E\) lie on this circle. Lines \(BC\) and \(DE\) cross at \(F\). Angles \(\angle BAD =\delta\), \(\angle CAE = \gamma\). Express the angle \(DFB\) in terms of \(\gamma\) and \(\delta\).