Prove that -i, i are the unique branch-points of arctan. In other words, show chat there does not exist a series centered at +1 that serves as a local inverse of san. Conversely, show that such a series exists for all zo ¢ {-i, i}.

Advanced Engineering Mathematics
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ISBN:9780470458365
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Chapter2: Second-order Linear Odes
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Prove that -i, i are the unique branch-points of arctan. In other words, show
that there does not exist a series centered at +1 that serves as a local inverse of
tan. Conversely, show that such a series exists for all zo 4 {-i, i}.
Transcribed Image Text:Prove that -i, i are the unique branch-points of arctan. In other words, show that there does not exist a series centered at +1 that serves as a local inverse of tan. Conversely, show that such a series exists for all zo 4 {-i, i}.
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