Show that cosh (ZI + Z2) = cosh ZI cosh Z2 + sinh ZI sinh Z2 sinh (ZI + Z2) = sinh Zl
Chapter 13, Problem 13.1.135(choose chapter or problem)
Show that
\(\cosh \left(z_{1}+z_{2}\right)=\cosh z_{1} \cosh z_{2}+\sinh z_{1} \sinh z_{2}\)
\(\sinh \left(z_{1}+z_{2}\right)=\sinh z_{1} \cosh z_{2}+\cosh z_{1} \sinh z_{2}\).
Text Transcription:
cosh (z_1 + z_2) = cosh z_1 cosh z_2 + sinh z_1 sinh z_2
sinh (z_1 + z_2) = sinh z_1 cosh z_2 + cosh z_1 sinh z_2
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