I wan to the solution for it

Prove (a) J. D() m'm ( a, B , Y ) = h \\ ( j t m)( j Fm'+ 1) D(!) m' fim (a, B, y) , where Dum (a, B,y) = (jm' R(a, B,y) jm), and (b) dim (1 + B) = (-1)im'dLD (B), where By d(i) m'm (B) = jm'le 'n jm) (15 points) " (a )