# Solve the equation cos x=-1/2

Solve the equation cos x=-1/2
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Peyton Atkins
$\mathrm{cos}x=-1/2$
$x=±\left(\pi -\mathrm{arccos}-1/2\right)+2\pi n$
$x=±\pi -\pi /3+2\pi n$
$x=±2\pi /3+2\pi n$, where n is an integer