16_(1+i)(1-1), find logz. 19. If z=- (2+i)

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( z=frac{(1+i)(1-i)}{2+i}=frac{1-i^{2}}{2+i}=frac{2}{2+i} ) ( log 3=log left(frac{2}{2+i}right)=log 2-log (2+i) )

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