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Calculate the imaginary number $i^k$
Answer
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$- 1$
It is $i^2 = -1$
$\color{#FF6800}{ i } ^ { \color{#FF6800}{ 2 } }$
$ $ It is $ i^2 = -1$
$\color{#FF6800}{ - } \color{#FF6800}{ 1 }$
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