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Complex Solutions of Quadratic Equations

10. Quadratic Equations / Complex Solutions of Quadratic Equations / 문제 1

문제 1

Which statement is true about the imaginary unit $i$ ?

A

$\frac{1}{i} = 0$

B

$i = - 1$

C

$i squared equals 1$

D

$i^{2} = - 1$