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The terminal side of an angle $ \theta$, in standard position, passes through the point A at $ \left( 3,-4 \right)$.

Find the exact value of the Cos $ \theta$.

A

$\cos { \theta =\cfrac { 5 }{ 4 } }$

B

$\cos { \theta =-\cfrac { 5 }{ 3 } }$

C

$\cos { \theta = \cfrac { 4 }{ 5 } }$

D

$\cos { \theta =-\cfrac { 3 }{ 5 } }$

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