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[=-pi/2," if "y<0quad " (where "y in R)]...

[=-pi/2," if "y<0quad " (where "y in R)],[" (16"12)" Let "z_(1)" and "z_(2)" be two complex numbers with "alpha" and "beta],[" weir principal arguments such that "alpha+beta>pi" ,then principal "],[(z_(1)z_(2))" is given by "],[[alpha+beta+pi," (b) "alpha+beta-pi],[alpha+beta-2 pi," (d) "alpha+beta]]

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