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For z E C {0} let e-27 F ( z ) - Cos(Z) 3z3 Then, O Rest(0) = -1/2 O Res,(0) = 1 O

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For z E C \\ {0} let e-27 F ( z ) - Cos(Z) 3z3 Then, O Rest(0) = -1/2 O Res,(0) = 1 O f(z) has a double pole in z = 0 O f(z) has a triple pole in z = 0

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