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Eugene Cross
Mathematics
19 September, 08:00
If x = a + bi and y = c + di, x * y = y * x.
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Martin Reeves
19 September, 08:08
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X = a + bi
y = c + di
xy = yx
(a + bi) (c + di) = (c + di) (a + bi)
a (c + di) + bi (c + di) = c (a + bi) + di (a + bi)
a (c) + a (di) + bi (c) + bi (di) = c (a) + c (bi) + di (a) + di (bi)
ac + adi + bci + bdi² = ac + bci + adi + bdi²
ac + adi + bci - bd = ac + bci + adi - bd
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