Apps. and Interpretation for IBDP Maths Ebook 2 | Page 75

1 � 1 11�
4 . Consider the complex numbers z1
� cis and z2
� cis . 3 6 9 12
( a ) ( i ) Express
4 z
1 in the form rcis� .
( ii ) Hence , find the real part of
z2
( b ) Express
4 z
1 in the form
4 z
1
. [ 4 ]
( i ) rcis� ;
( ii )
i re � .
[ 3 ]

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