The amplitude of the complex number \[z=\sin \alpha +i(1-\cos \alpha )

1.	The amplitude of the complex number \[z=\sin \alpha +i(1-\cos \alpha )\] is
A.	\[2\sin \frac{\alpha }{2}\]
B.	\[\frac{\alpha }{2}\]
C.	\[\alpha \]
D.	None of these
Answer» C. \[\alpha \]

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The amplitude of the complex number \[z=\sin \alpha +i(1-\cos \alpha )\] is

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