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4. Find the isolated singularities of the following functions, and determine whether they are remo ...
4. Find the isolated singularities of the following functions, and determine whether they are removable, essential, or poles. Also find the order of any poles. (a) f(z) = COS Z (b) g(2) = log (1 - ), where log:C\(-00,0] ? C is a branch of logarithm (c) h(z) 1-e2 (d) w(2) = sin