COS Function in Oracle SQL – PLSQL

The COS function in Oracle SQL / PLSQL is used to calculate cosine of numeric value where numeric value is provided in radian format.

It’s mathematically equal to COS(N).

Syntax for the COS function in Oracle SQL / PLSQL is:

SELECT COS(radian)
FROM table_name;

Let’s take an example for understanding:
Suppose we want to get the cosine of 30 degree.

SELECT COS(30*22/(7*180))
FROM dual;

The output of the above statement will be:

Notice that we have changed 30 degrees into radians while passing it in COS function.