Find the value of $cos (300^{\circ})$

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Solution

$cos (300^{\circ})$
$= cos (1 \times 360^{\circ} - 60^{\circ})$
$= cos (- 60^{\circ})$ since $cos (2 n π - θ) = cos (- θ)$
$= cos 60^{\circ}$ since $cos (- θ) = cos θ$
$= \frac{1}{2}$

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