COS

Returns the cosine value of a numeric expression

Syntax

COS( expr )

Arguments

Parameter Description
expr Numeric expression representing an angle in radians

Returns

Always returns a floating point result of the cosine.

Notes

  • The result is in the range [-1, 1].
  • If the input value is NULL, the result is NULL.

Examples

For these examples, consider the following table and contents:

CREATE TABLE trig(f DOUBLE);

INSERT INTO trig VALUES (0), (PI()/12), (PI()/8), (PI()/6)
   , (PI()/4), (PI()/3), (3*PI()/8), (5*PI()/12), (PI()/2);

Cosine of 0 (= 1)

numbers=> SELECT COS(0);
cos
---
1.0

Computing cosine for a column, in radians

numbers=> SELECT f, COS(f) FROM trig;
f      | cos
-------+-------
     0 |      1
0.2618 | 0.9659
0.3927 | 0.9239
0.5236 |  0.866
0.7854 | 0.7071
1.0472 |    0.5
1.1781 | 0.3827
 1.309 | 0.2588
1.5708 |      0