Oracle SQL - Function TAN function

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Introduction

TAN - Returns the tangent of a value.

The TAN function takes arguments in radians where, 

radians  = (angle * 2 * 3.1416 / 360)

Using the TAN function to find the tangent of 30 degrees:

Demo

SQL>
SQL> SELECT TAN(30*2*3.1416/360)
  2  FROM dual;--  w ww  .  j a v a 2  s  . c om

TAN(30*2*3.1416/360)
--------------------
            00000.58

SQL>