\begin{array}{l} c o s (α \pm 360^{\circ}) = c o s (α) \\ c o s (α \pm 180^{\circ}) = - c o s (α) \\ c o s (α \pm 90^{\circ}) = - s i n (α) \end{array}

${\begin {array} {l} cos(\alpha \pm 360^\circ) = cos(\alpha) \\ cos(\alpha \pm 180^\circ) = - cos(\alpha) \\ cos(\alpha \pm 90^\circ) = - sin(\alpha) \end {array}}$

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