Math Chapter Wise Complex Integration, Cauchy's Theorem And Calculus Of Residue English MCQ DSSSB PGT 2021 Q.The function f(z) = z e 2 2 1 − has AAn essential singularity at z = 0 BA pole at z = 0 CAn essential singularity at z = ∞ DNo singularity Show answer Correct answer: An essential singularity at z = 0