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

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. …

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).

3 days ago · Free online arccos calculator tool to find inverse cosine values instantly. Use our free scientific calculator for trigonometry, physics, chemistry & more. Accurate, easy, and 100% free.

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Calculate the arccos (inverse cosine) of any value between -1 and 1. Get results in both degrees and radians with this free online arccos calculator.

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

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).

If you know the three sides of a triangle, and you'd like to find any of the triangle's angles, you'll need to use arccos: find everything about this law at our law of cosines calculator.