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Formula
Calculate the value
Answer
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$\sqrt{ -1 }$
$i$
The definition of the imaginary number $i$ is $\sqrt{-1}$
$\sqrt{ \color{#FF6800}{ - } \color{#FF6800}{ 1 } }$
$ $ It is $ \sqrt{-1} = i$
$\color{#FF6800}{ i }$
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