Function cos() calculates the cosine value of a radian.

Arguments：

• Radian <number>

Returns：

• Cosine <number>, ∈ [-1, 1]

Common Usage

Example: Calculate the cosine value of the radian 60°

return cos(60 * pi() / 180)

Example: Calculate the cosine values of the radian of a column

uncollect [1, 2.5, 3] as a
return cos(a)