\[\cosh (\alpha +i\beta )-\cosh (\alpha -i\beta )\] is equal to [RPET 2000]

\[2\,\,\cosh \,\alpha \,\,\cos \,\beta \]

\[2\,\,\sinh \,\alpha \,\,\sinh \,\beta \]

\[2\,\,\cosh \,\alpha \,\,\cosh \,\beta \]

\[2i\,\,\sinh \,\alpha \,\,\sin \,\beta \]

\[\cosh (\alpha +i\beta )-\cosh (\alpha -i\beta )\] is equal to [RPET

1.	\[\cosh (\alpha +i\beta )-\cosh (\alpha -i\beta )\] is equal to [RPET 2000]
A.	\[2\,\,\sinh \,\alpha \,\,\sinh \,\beta \]
B.	\[2\,\,\cosh \,\alpha \,\,\cosh \,\beta \]
C.	\[2i\,\,\sinh \,\alpha \,\,\sin \,\beta \]
D.	\[2\,\,\cosh \,\alpha \,\,\cos \,\beta \]
Answer» D. \[2\,\,\cosh \,\alpha \,\,\cos \,\beta \]

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\[\cosh (\alpha +i\beta )-\cosh (\alpha -i\beta )\] is equal to [RPET 2000]

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