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Online arccos (x) calculator. Inverse cosine calculator. Enter the cosine value, select degrees (°) or radians (rad) and press the = button.

For a circle of radius 1, arcsin and arccos are the lengths of actual arcs determined by the quantities in question. Several notations for the inverse trigonometric functions exist.

Arccosine, written as arccos or cos -1 (not to be confused with ), is the inverse cosine function. Both arccos and cos -1 are the same thing. Cosine only has an inverse on a restricted domain, 0 ≤ x ≤ π. …

What is Arccosine Formula? In a right triangle, if θ is one of the acute angles, then cos θ = (adjacent)/ (hypotenuse). Then θ = arccos ( (adjacent)/ (hypotenuse). This is the formula of arccosine (or arccos).

Use this arccos calculator to easily calculate the arccosine of a number. Supports input of either decimal numbers (e.g. 0.5, -0.5) or fractions (e.g. 1/2, -1/2).

No. Cosine takes an angle and gives a y-value on the unit circle. And arccosine is the opposite: it takes a y-value on the unit circle and tells you the required angle to get that y-value. So, arccos (cos (x)) …

Definition of the arccos function in trigonometry. The inverse of the cosine function. The angle whose cosine is a given number.

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May 20, 2025 · Find the angle from a cosine value with this easy Arccos Calculator. Supports degrees, radians, exact values, visual steps, and unit circle visualization.