Arccosine

Definition

The arccosine of a number is the angle whose cosine is that number. It gives us the measure of an angle in radians or degrees.

Related terms

Cosine: A trigonometric function that relates the ratio of adjacent side length to hypotenuse length in a right triangle.

Inverse Function: A function that undoes another function. In this case, arccosine is the inverse function of cosine.

Range: The set of all possible output values for a given function. For arccosine, its range is between 0° and 180° (or 0 radians and π radians).