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Mathematics 9 Online
OpenStudy (anonymous):

https://plus.google.com/u/0/101379197538793682217#photos/101379197538793682217/albums/5743040423500900513/5743040422674985618

OpenStudy (anonymous):

z1=3e^(ipi/4) z2=7e^(3ipi/8) z1z2=21e^( (1/4+3/8) i pi)

OpenStudy (kropot72):

The exponential form of the answer by Davidc converts to the following polar form:\[21(\cos \frac{5\pi}{8}+i \sin \frac{5\pi}{8})\]

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