The value of expression \[\left( \cos \frac{\pi }{2}+i\sin \frac{\pi }{2} \right)\] \[\,\left( \cos \frac{\pi }{{{2}^{2}}}+i\sin \frac{\pi }{{{2}^{2}}} \right)\]........to \[\infty \] is [Kurukshetra CEE 1998]

The value of expression \[\left( \cos \frac{\pi }{2}+i\sin \frac{\pi }

1.	The value of expression \[\left( \cos \frac{\pi }{2}+i\sin \frac{\pi }{2} \right)\] \[\,\left( \cos \frac{\pi }{{{2}^{2}}}+i\sin \frac{\pi }{{{2}^{2}}} \right)\]........to \[\infty \] is [Kurukshetra CEE 1998]
A.	\[-1\]
B.	\[1\]
C.	0
D.	2
Answer» B. \[1\]