# Function sec Calculate the secant of a value, defined as `sec(x) = 1/cos(x)`. For matrices, the function is evaluated element wise. ## Syntax ```js math.sec(x) ``` ### Parameters Parameter | Type | Description --------- | ---- | ----------- `x` | number | Complex | Unit | Array | Matrix | Function input ### Returns Type | Description ---- | ----------- number | Complex | Array | Matrix | Secant of x ### Throws Type | Description ---- | ----------- ## Examples ```js math.sec(2) // returns number -2.4029979617223822 1 / math.cos(2) // returns number -2.4029979617223822 ``` ## See also [cos](cos.md), [csc](csc.md), [cot](cot.md)