# math/cos Cosine of an angle in radians. ## Syntax

[math/cos $x]

## Parameters - `$x` — Angle in radians ## Examples

[math/cos 0]    # 1
[math/cos 1]    # 0.5403023058681398

## Returns Number — cosine of `$x`, in the range [-1, 1]. ## See Also `math/sin`, `math/tan`, `math/acos`, `math/pi`