With the aid of expressions (15) and (16) in Sec. 34 for |sin z|2 and |cos z|2,
Question:
(a) |sinh y| ≤ |sin z| ≤ cosh y;
(b) |sinh y| ≤ |cos z| ≤ cosh y.
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Related Book For 
Complex Variables and Applications
ISBN: 978-0073051949
8th edition
Authors: James Brown, Ruel Churchill
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