1 � 1 � 16 . Consider the complex numbers z 1
� cis and z2
� cis . 2 10 8 4
( a ) ( i ) Express
5 z
1 in the form rcis� .
( ii ) Hence , write down the real part of
( b ) Express z z
5 1
2 in the form
5 z
1
. [ 3 ]
( i ) rcis� ;
( ii ) i re � .
[ 3 ]
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