Arcsin of 2/5
Arcsin, Arccos, Arctan, Arccot
What is arcsin(2/5)?
Answer
arcsin(2/5) ≈
23.5782° ≈ 0.4115 rad
Range: arcsin x is an angle from −90° to 90°, so the answer is unique.
≈ — the value is not a table one; rounded to 4 decimal places.
2/5 = 0.4.
arcsin(2/5) is the angle α in [−90°, 90°] with sin α = 2/5.
sin 23.5782° ≈ 0.4000
α = arcsin(2/5) ≈ 23.5782°
P ≈ (0.9165, 0.4)
P lies on the line y = 2/5 in the right half of the circle, where cos α ≥ 0; highlighted: sin α = 2/5.
| Function | Degrees | Radians |
|---|---|---|
| arcsin(2/5) | ≈ 23.5782° | ≈ 0.4115 |
| arccos(2/5) | ≈ 66.4218° | ≈ 1.1593 |
| arctan(2/5) | ≈ 21.8014° | ≈ 0.3805 |
| arccot(2/5) | ≈ 68.1986° | ≈ 1.1903 |
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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/arcsin--2-5">Arcsin of 2/5 (Inverse Sine) in Degrees and Radians</a>Facebook
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![Arcsin of 2/5 (Inverse Sine) in Degrees and Radians. arcsin(2/5) ≈ 23.5782° ≈ 0.4115 rad: the angle in [−90°, 90°] whose sine is 2/5. With the check and the unit circle.](https://calculat.io/en/number/inverse-trigonometry/arcsin--2-5/generated.jpg)
Arcsine of nearby values
| x | arcsin x |
|---|---|
| 1/5 | ≈ 11.5370° |
| 1/4 | ≈ 14.4775° |
| 0.3 | ≈ 17.4576° |
| 2/5 | ≈ 23.5782° |
| 1/2 | 30° = π/6 |
| 3/5 | ≈ 36.8699° |
| 2/3 | ≈ 41.8103° |