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Find the exact value, in radian measure, of $\arcsin { \left( \cfrac { -1 }{ 2 } \right) }$.

A

$ -\cfrac { 2\pi }{ 3 } $

B

$-\cfrac { \pi }{ 4 }$

C

$-\cfrac { \pi }{ 6 } $

D

$\cfrac { \pi }{ 6 }$

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