Assuming asking for M.Sc Physics Hon, Here are some of the books you can prefer given below:
M. R. Spiegel (Schaum’s outline series) – Theory and Problems of Complex Variables. G. Arfken (Academic Press) – Mathematical Methods for Physicists. J. Mathews and R. I. Walker (Benjamin) – Mathematical Methods of Physics. P. Dennery and A. Krzywicki (Harper and Row) – Mathematics for Physicists
Good Luck!
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