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## cotangent function

The `cot` function is a trigonometric function. The `cot` function returns the cotangent of an angle specified in radians.

Syntax:

    double cot(n)

Semantics:

- n: The argument n is an expression that resolves to a number (an angle expressed in radians).
- return type: double.
  - 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 12-78 cotangent function

    SELECT cot(n) FROM Archery

Value of n | Output
--- | ---
0 | Infinity
radians(90) | 6.123233995736766E-17
pi()/4 | 1.0000000000000002