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Formula
Calculate the value
Answer
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$$\cos\left( 135 ^ { \circ } \right)$$
$- \dfrac { \sqrt{ 2 } } { 2 }$
Simplify the expression
$\color{#FF6800}{ \cos\left( 135 ^ { \circ } \right) }$
$ $ Simplify $ $
$\color{#FF6800}{ - } \color{#FF6800}{ \cos\left( 45 ^ { \circ } \right) }$
$- \color{#FF6800}{ \cos\left( 45 ^ { \circ } \right) }$
$\cos\left(45^{\circ}\right) $ is $ \dfrac{\sqrt{2}}{2}$
$- \color{#FF6800}{ \dfrac { \sqrt{ 2 } } { 2 } }$
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