Calculate the inverse cosine of a number.

`ACOS(number)`

- number - cosine of the angle, must be from -1 to 1

`=ACOS(0.5) * 180/PI()`

To convert it to degrees, use the formula above, where x is a number between -1 and 1. For example, the formula above returns 60 degrees.The ACOS function returns the arccosine of a number. The arccosine is the inverse of the cosine function, and is measured in radians.

`=ACOS(0.5)`

The ACOS function can also return the arccosine in radians like in the formula above which returns 1.047 radians.

The ACOS function in Excel is a trigonometric function that calculates the arccosine (inverse cosine) of a given number. The function returns an angle, measured in radians, whose cosine is the specified number.

- The ACOS function requires that its input is between -1 and 1 and returns an angle in radians.
- The angle returned by the ACOS function is the angle of a triangle when given the ratio of the adjacent side over the hypotenuse.
- The DEGREES function can be used to convert the result of ACOS to degrees.

The ACOS function is used to return the inverse cosine of a number. This inverse cosine is also known as the arccosine, and it is the angle whose cosine is the number.

The argument of the ACOS function is a cosine of an angle.

The result of the ACOS function is a number in radians.

The argument of ACOS must be a number from -1 to 1.

You can convert the result of the ACOS function from radians to degrees using the DEGREES function, or by multiplying the result by 180/PI().

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