\[\frac{1-i}{1+i}\]is equal to [RPET 1984]

1.	\[\frac{1-i}{1+i}\]is equal to [RPET 1984]
A.	\[\cos \frac{\pi }{2}+i\sin \frac{\pi }{2}\]
B.	\[\cos \frac{\pi }{2}-i\sin \frac{\pi }{2}\]
C.	\[\sin \frac{\pi }{2}+i\cos \frac{\pi }{2}\]
D.	None of these
Answer» C. \[\sin \frac{\pi }{2}+i\cos \frac{\pi }{2}\]

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\[\frac{1-i}{1+i}\]is equal to [RPET 1984]

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