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The graph of y = arccos (x) is shown below. As can be seen from the figure, y = arccos (x) is a reflection of cos (x), given the restricted domain 0 ≤ x ≤ π, across the line y = x.

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

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 …

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

Jul 23, 2025 · The inverse of the cosine function, the arccosine function (arccos or cos⁻¹), returns the angle whose cosine is a given value. Its definition spans values from -1 to 1, and its output …

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).

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.

Oct 29, 2025 · Learn how to draw and interpret the arccos graph. Understand its shape, range, and relationship to cosine in this clear guide to inverse trigonometric functions

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