Arctan of 2/5
Arcsin, Arccos, Arctan, Arccot
What is arctan(2/5)?
Answer
arctan(2/5) ≈
21.8014° ≈ 0.3805 rad
Range: arctan x is an angle strictly between −90° and 90°, so the answer is unique.
≈ — the value is not a table one; rounded to 4 decimal places.
2/5 = 0.4.
arctan(2/5) is the angle α in (−90°, 90°) with tan α = 2/5.
tan 21.8014° ≈ 0.4000
α = arctan(2/5) ≈ 21.8014°
P ≈ (0.9285, 0.3714)
T(1, 2/5) is where line OP meets the line x = 1; highlighted: tan 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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Arctangent of nearby values
| x | arctan x |
|---|---|
| 1/4 | ≈ 14.0362° |
| 0.3 | ≈ 16.6992° |
| 1/3 | ≈ 18.4349° |
| 2/5 | ≈ 21.8014° |
| 1/2 | ≈ 26.5651° |
| √3/3 | 30° = π/6 |
| 3/5 | ≈ 30.9638° |