OpenOffice3.org Calc 3. Mathematical Functions
ATAN(Number) Function
Calculates the arctangent of the argument
“Number”. Returns a numeric value in radians. The argument “Number” can take any
numeric value, positive, negative or zero. This function returns a number
greater than or equal to -pi/2 and less than or equal to pi/2. For example:
=ATAN(0) Returns 0.
=ATAN(1) Returns 0,785.
=ATAN(-2) Returns -1,107.