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

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Arccos calculator to easily calculate the arc cosine (inverse cosine) function of any number. Calculate arccos (x) in degrees and radians with this trigonometric calculator.

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. The domain of arccos (x) is -1 ≤ x ≤ 1 and its range is 0 ≤ y ≤ π.

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.

Jan 24, 2024 · The tool computes θ = arccos (x) as the principal value in radians, then shows degrees as well. It also displays sin (θ) and a clean unit-circle visualization of the radius, projections, and point.

Jan 7, 2026 · Calculate arccos (inverse cosine) instantly with interactive unit circle visualization, step-by-step solutions, degree and radian outputs, and up to 1000 decimal places precision.

Is Arccosine Same As (cos x)⁻¹? No. Arccosine is the inverse of cosine function, i.e., arccos x = cos -1 x. But it is NOT equal to (cos x) -1, as (cos x) -1 = 1/ cos x = sec x.

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Thanks to our tool, you can quickly find arccos - which is, surprisingly, the primary use of this calculator. However, for those of you eager to learn more, we've prepared a short article explaining what the …