a. ∣3−4i∣=9+16=5,arg(3−4i)=arctan(−4/3)≈−530
b.∣−2+i∣=4+1=5,arg(−2+i)=arctan(−1/2)+1800≈153.40
c.∣1+2i1∣=∣1+21−i2∣=∣1/3−i2/3∣=1/9+2/9=3/3
arg1+i21=arctan(−2)≈54.70
d.∣−3−3i7−i∣=∣−3⋅2(7−i)(1−i)∣=∣−1+i4/3∣=1+16/9=5/3
arg(−1+i4/3)=arctan(−4/3)+1800≈1270
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