Equations and Inequalities. Using the definitions, prove: Isinh yl ~ lcos zl ~ cosh y
Chapter 13, Problem 13.1.155(choose chapter or problem)
Using the definitions, prove:
\(|\sinh y| \leqq|\cos z| \leqq \cosh y,|\sinh y| \leqq|\sin z| \leqq \cosh y\). Conclude that the complex cosine and sine are not bounded in the whole complex plane.
Text Transcription:
|sinh y| leqq |cos z| leqq cosh y, |sinh y| leqq| sin z| leqq cosh y
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