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Unit Circle Equivalencies

SATSTM-F1NSX7

If $\cos135^{\circ}=\cos(x)$, then $x$ could equal which one of the following?

A

$\text{45 degrees}$

B

$\text{120 degrees}$

C

$\text{315 degrees}$

D

$\text{225 degrees}$

E

$\text{405 degrees}$