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OpenStudy (anonymous):
(1+3i) (1-i) ?
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OpenStudy (3psilon):
Foil \[1^{2} -i+3i-3i^{2}\] \[i^{2} = -1\] \[2i + 1 -(-3) = 4 + 2i\]
OpenStudy (3psilon):
Get it ?
OpenStudy (anonymous):
yeahh thank you
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