6. Let 0≤rR≤∞andf∈H(A(0;r,R)).
(a) Show that iffis even, then the Laurent series offonA(0;r,R) has nonzero terms only of even degree.
(b) Show that iffis odd, then the Laurent series offonA(0;r,R) has nonzero terms only of odd degree.
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