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## cosine function

The `cos` function is a trigonometric function. The `cos` function returns the cosine of an angle specified in radians.

Syntax:

    double cos(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 12-77 cosine function

    SELECT cos(n) FROM Archery

Value of n | Output
--- | ---
0 | 1.0
radians(90) | 6.123233995736766E-17
pi() | -1.0