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Trigonometry

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Moderate

Finding Cos of 45 degrees

TRIG-GDEZYO

What is $\cos{ 45^o }$?

A

$\cfrac { \sqrt { 2 } }{ 2 }$

B

$\cfrac { -\sqrt { 2 } }{ 2 } $

C

$\cfrac { \sqrt { 3 } }{ 2 }$

D

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

E

$\cfrac { 1 }{ 2 } $

F

$\cfrac { -1 }{ 2 }$