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Calculate the value
Answer
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$- \dfrac { 1 } { 2 }$
Simplify the expression
$\color{#FF6800}{ \cos\left( \color{#FF6800}{ 120 } ^ { \circ } \right) }$
$ $ Simplify $ $
$\color{#FF6800}{ - } \color{#FF6800}{ \cos\left( \color{#FF6800}{ 60 } ^ { \circ } \right) }$
$- \color{#FF6800}{ \cos\left( \color{#FF6800}{ 60 } ^ { \circ } \right) }$
$\cos\left(60^{\circ}\right) $ is $ \dfrac{1}{2}$
$- \color{#FF6800}{ \dfrac { \color{#FF6800}{ 1 } } { \color{#FF6800}{ 2 } } }$
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