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
Correct Answer: C
Solution :
It is obvious.
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