COS¶
Returns the cosine value of a numeric expression.
Syntax¶
COS( expr )
Arguments¶
Parameter |
Description |
|---|---|
|
Numeric expression representing an angle in radians |
Returns¶
When using the COS floating point number scalar function, real arguments are automatically cast to double precision.
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