The imaginary part of \[\cosh (\alpha +i\beta )\]is [RPET 2000]

1.	The imaginary part of \[\cosh (\alpha +i\beta )\]is [RPET 2000]
A.	\[\cosh \,\alpha \,\,\cos \,\beta \]
B.	\[\sinh \,\alpha \,\,\sin \,\beta \]
C.	\[\cos \alpha \cosh \beta \]
D.	\[\cos \alpha \cos \beta \]
Answer» C. \[\cos \alpha \cosh \beta \]

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The imaginary part of \[\cosh (\alpha +i\beta )\]is [RPET 2000]

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