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Calculate the value
Answer
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$- 1$
Simplify the expression
$\color{#FF6800}{ \cos\left( \color{#FF6800}{ \pi } \right) }$
$\cos\left(\pi\right) $ is -1 $ $
$\color{#FF6800}{ - } \color{#FF6800}{ 1 }$
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