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Given that an angle is in a unit circle (radius is 1):
(See the unit circle below)

Find the exact value of $\text{ sine}\:{ 45 }^{ o }$.

James Gunnin Created for Albert.io. Copyright 2016. All rights reserved

A

$ \frac { \sqrt { 2 } }{ 2 }$

B

$\cfrac { 1 }{ 2 }$

C

$\sqrt { 2 } $

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