PostgreSQL tan() Function

The PostgreSQL tan() function returns the tangent of the specified radian.

tan() Syntax

This is the syntax of the PostgreSQL tan() function:

tan(number)

Parameters

number

Required. The number used to calculate the tangent, in radians.

Return value

The PostgreSQL tan() function returns the tangent of the specified radian.

If the parameter number is NULL, the tan() function will return NULL.

tan() Examples

Here are a few examples of the tan() function:

SELECT
    tan(2.5) AS "tan(2.5)",
    tan(0.2) AS "tan(0.2)",
    tan(-0.5) AS "tan(-0.5)",
    tan(-0.2) AS "tan(-0.2)",
    tan(0) AS "tan(0)",
    tan(pi()) AS "tan(pi())";

-[ RECORD 1 ]----------------------
tan(2.5)  | -0.7470222972386602
tan(0.2)  | 0.2027100355086725
tan(-0.5) | -0.5463024898437905
tan(-0.2) | -0.2027100355086725
tan(0)    | 0
tan(pi()) | -1.2246467991473532e-16

Here, we used the pi() function to obtain an approximation of pi.