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12 cards from this deck
b2−4ac<0b^2 - 4ac < 0b2−4ac<0
b2−4acb^2 - 4acb2−4ac
x=−b±b2−4ac2ax = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}x=2a−b±b2−4ac
a+bia + bia+bi
−1\sqrt{-1}−1
−1-1−1
aaa
bbb
a−bia - bia−bi (conjugate pair)
zzz
2i2i2i
2−3i2 - 3i2−3i
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