Math Chapter Wise Complex Integration, Cauchy's Theorem And Calculus Of Residue English MCQ PGT 2003 Q.The function f(z) = xy Ais regular and Cauchy–Riemann (C–R) equation are satisfied Bis regular but C–R equations are not satisfied Cis not regular at z=0 and C–R equations are not satisfied Dis not regular at z=0 but C–R equations are satisfied Show answer Correct answer: is not regular at z=0 but C–R equations are satisfied