# Futurebasic/Language/Reference/sin

## SIN edit

### Syntax edit

*theSine#* = **SIN**(*expr*)

### Description edit

Returns the sine of

, where *expr*

is given in radians. The returned value will be in the range -1 to +1. *expr*

always returns a double-precision result.
**SIN**

### Note edit

To find the sine of an angle `degAngle`

which is given in degrees, use the following:

` theSine# = `

**SIN**(degAngle * pi# / 180)

where `pi#`

equals 3.14159265359

### See Also edit

`ASIN; COS; TAN; USR _sine`