MCQOPTIONS
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| 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 | |