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Question for using complex variables


Hellow !!!

I'd like to use complex variable computation, but I do not know how. 
Here is my program;
Here, x, y, w, and z are all real values. Then I expected

Complex[x,y]*Complex[w,z]=(xw-yz)+I(xz+yw)

But I can't get it. Please let me know how .
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                                   Chongdae Park
                                   Dept. of Electronic Engineering
                                   Myongji University
                                   San 38-2, Nam-Dong, Yongin
                                   Kyoungki-Do, Korea  
                                   Zipcode : 449-728
                                   Phone   : +82-335-30-6379
                                   Fax     : +82-335-21-0271
                                   email   : cdpark at wh.myongji.ac.kr
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