Use the result in Exercise 7 to find the residue at z = 0 of the function

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Use the result in Exercise 7 to find the residue at z = 0 of the function
(a) f(z) = csc2z;
(b) f(z) = 1/(z + z2)2
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Complex Variables and Applications

ISBN: 978-0073051949

8th edition

Authors: James Brown, Ruel Churchill

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