Arccos of 0.9
Arcsin, Arccos, Arctan, Arccot
What is arccos(0.9)?
Answer
arccos(0.9) ≈
25.8419° ≈ 0.4510 rad
Range: arccos x is an angle from 0° to 180°, so the answer is unique.
≈ — the value is not a table one; rounded to 4 decimal places.
arccos(0.9) is the angle α in [0°, 180°] with cos α = 0.9.
cos 25.8419° ≈ 0.9000
α = arccos(0.9) ≈ 25.8419°
P ≈ (0.9, 0.4359)
P lies on the line x = 0.9 in the upper half of the circle, where sin α ≥ 0; highlighted: cos α = 0.9.
| Function | Degrees | Radians |
|---|---|---|
| arcsin(0.9) | ≈ 64.1581° | ≈ 1.1198 |
| arccos(0.9) | ≈ 25.8419° | ≈ 0.4510 |
| arctan(0.9) | ≈ 41.9872° | ≈ 0.7328 |
| arccot(0.9) | ≈ 48.0128° | ≈ 0.8380 |
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See Also
- Sin, Cos, Tan, Cot of an Angle - Exact value in square roots and the decimal, with reduction to an acute angle on the unit circle
- Square Root Calculator - Calculate the square root of any number
- Simplify Square Root Calculator - Write any square root in simplest radical form, step by step
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<a href="https://calculat.io/en/number/inverse-trigonometry/arccos--0.9">Arccos of 0.9 (Inverse Cosine) in Degrees and Radians</a>Facebook
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![Arccos of 0.9 (Inverse Cosine) in Degrees and Radians. arccos(0.9) ≈ 25.8419° ≈ 0.4510 rad: the angle in [0°, 180°] whose cosine is 0.9. With the check and the unit circle.](https://calculat.io/en/number/inverse-trigonometry/arccos--0.9/generated.jpg)
Arccosine of nearby values
| x | arccos x |
|---|---|
| 3/4 | ≈ 41.4096° |
| 4/5 | ≈ 36.8699° |
| √3/2 | 30° = π/6 |
| 0.9 | ≈ 25.8419° |
| 12/13 | ≈ 22.6199° |
| 1 | 0° = 0 |
| 2 | does not exist |