#### 7.7.3 Trigonometric Functions

Trigonometric functions take numeric arguments and produce numeric
results.

- Function:
**ARCOS** `(``number`)

¶
- Function:
**ACOS** `(``number`)

¶
Takes the arccosine, in radians, of `number`. Results in
system-missing if `number` is not between -1 and 1 inclusive.
This function is a PSPP extension.

- Function:
**ARSIN** `(``number`)

¶
- Function:
**ASIN** `(``number`)

¶
Takes the arcsine, in radians, of `number`. Results in
system-missing if `number` is not between -1 and 1 inclusive.

- Function:
**ARTAN** `(``number`)

¶
- Function:
**ATAN** `(``number`)

¶
Takes the arctangent, in radians, of `number`.

- Function:
**COS** `(``angle`)

¶
Takes the cosine of `angle` which should be in radians.

- Function:
**SIN** `(``angle`)

¶
Takes the sine of `angle` which should be in radians.

- Function:
**TAN** `(``angle`)

¶
Takes the tangent of `angle` which should be in radians.
Results in system-missing at values
of `angle` that are too close to odd multiples of *\pi/2*.
Portability: none.