Syntax
ACOT(number)
| Parameter | Description |
|---|---|
| number | Parameter of the ACOT function. |
Examples
Arccotangent of 1
Formula
=ACOT(1)
Returns ~0.7854 (π/4 radians or 45°). The angle whose cotangent is 1 is 45°, same as ATAN(1).
Convert to degrees
Formula
=DEGREES(ACOT(2))
Returns ~26.57°. The angle whose cotangent is 2 is about 26.6 degrees.
Complement of ATAN
Formula
=DEGREES(ACOT(1)) + DEGREES(ATAN(1))
Returns 90. ACOT(x) + ATAN(x) = π/2 (90°) for any positive x. They are complementary functions.
Common Errors
#VALUE!
Non-numeric input returns #VALUE!. ACOT accepts any real number.
Tips
Relationship to ATAN
ACOT(x) = π/2 - ATAN(x) for positive x. If you know how to use ATAN, you can always compute ACOT from it.
Range is 0 to π
ACOT returns values from 0 to π (0° to 180°), never negative. This is different from ATAN which returns -π/2 to π/2.
Accepts any number
Like ATAN, ACOT accepts any real number. There are no domain restrictions (unlike ASIN/ACOS which require -1 to 1).
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