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Calculate the value
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$- 2 i$
Calculate the value
$\left ( 1 - \sqrt{ \color{#FF6800}{ - } \color{#FF6800}{ 1 } } \right ) ^ { 2 }$
$ $ It is $ \sqrt{-1} = i$
$\left ( 1 - \color{#FF6800}{ i } \right ) ^ { 2 }$
$\left ( \color{#FF6800}{ 1 } \color{#FF6800}{ - } \color{#FF6800}{ i } \right ) ^ { \color{#FF6800}{ 2 } }$
$ $ Expand the square of a binomial including imaginary numbers $ $
$\color{#FF6800}{ - } \color{#FF6800}{ 2 } \color{#FF6800}{ i }$
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