COS

All functions > MATH > COS

Returns the cosine of an angle in radians.

Signatures

Returns: Cosine value (between -1 and 1)

COS(radians: T) → DOUBLE

Notes

• Input angle must be in radians (use RADIANS() to convert from degrees)
• Returns values in the range [-1, 1]
• COS(0) = 1, COS(π/2) = 0, COS(π) = -1
• Period of 2π: COS(x) = COS(x + 2π)
• Even function: COS(-x) = COS(x)
• Returns NULL if input is NULL

Examples

SELECT
    f1 := COS(0e0),  -- Cosine of 0 radians is 1
    f2 := COS(3.141592653589793e0),  -- Cosine of π radians is -1
    f3 := COS(1.5707963267948966e0),  -- Cosine of π/2 radians is ~0
    f4 := COS(6.283185307179586e0),  -- Cosine of 2π radians is 1
    f5 := COS(-1.5707963267948966e0)  -- Even function: COS(-π/2) = COS(π/2)
;