Documentation/Calc Functions/ATAN
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Function name:
ATAN
Category:
Mathematical
Summary:
Returns the inverse trigonometric tangent (the arctangent) of a number. This function calculates the principal value.
Syntax:
ATAN(Number)
Returns:
This function returns the inverse trigonometric tangent of Number, that is the angle (in radians) whose tangent is Number. The angle returned is between -PI/2 and PI/2, i.e. [-π/2,+π/2].
Arguments:
Number is the real number, or a reference to a cell containing that number whose inverse trigonometric tangent value is to be calculated.
Additional details:
- To return the angle in degrees, use the DEGREES function.
- Alternatively multiply by 180/PI() to convert the result from radians to degrees.
The GIF below illustrates the function ATAN.
Examples:
Formula | Description | Returns |
---|---|---|
=ATAN(1) | Inverse trigonometric tangent of 1 | 0.785398163397448 (PI/4 radians or π/4) |
=ATAN(0.5) | Inverse trigonometric tangent of 0.5 | 0.463647609000806 (radians) |
=DEGREES(ATAN(1)) | Inverse trigonometric tangent of 1. Further, converting angle in radians to degrees. | 45° (degrees) |
=ATAN(-1)*180/PI() | Inverse trigonometric tangent of -1. Further, converting angle in radians to degrees by multiplying by 180/PI(). | -45° (degrees) |
Related LibreOffice functions:
ODF standard:
Equivalent Excel functions:
ATAN