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OpenStudy (anonymous):
ah
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OpenStudy (nurali):
sqrt(-49) / [ (7-2i) - (4+9i) ] = 7i / (3 - 11i) = 7i (3+11i) / [ (3 - 11i) (3 + 11i) ] = (21 i - 77) / (9 + 121) = choice (d), (-77 + 21i) / 130
OpenStudy (nurali):
sqrt(-1)=sqrt(1*i)
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