Complex numbers 一課 在Add Maths 課程內 何時加入? 何時out syll.?

This topic was introduced in 1967 (which is the 1st year that A.Math to be an exam subject in Hong Kong), and was cut out from the syllabus since 2004 (at that time, the whole A.Math syllabus was revised such that a portion of topics was removed..)