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## tangent function

The `tan` function is a trigonometric function. The `tan` function returns the tangent of an angle specified in radians.

Syntax:

    double tan(n)

Semantics:

- n: The argument n is an expression that resolves to a number (an angle expressed in radians).
- return type: double.

  The resultant value is in the range -1 through 1 with the following exceptions:

  - Returns a NULL value in the following cases:
    - n resolves to a NULL value
    - n does not resolve to a number
  - Returns NaN if n resolves to NaN or infinity(positive/negative).

Example 12-94 tangent function

    SELECT tan(n) FROM Archery

Value of n | Output
--- | ---
0 | 0.0
radians(90) | 1.633123935319537E16
pi()/4 | 0.9999999999999999