1.

\[\cos (x+iy)\]is equal to [RPET 2001]

A. \[\sin \,x\,\,\cosh \,y+i\,\cos \,x\,\,\sinh \,y\]
B. \[\cos \,x\,\,\cosh \,y+i\,\sin \,x\,\,\sinh \,y\]
C. \[\cos \,x\,\,\cosh \,y-i\,\sin \,x\,\,\sinh \,y\]
D. None of these
Answer» D. None of these


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