Arctan of −2
Arcsin, Arccos, Arctan, Arccot
What is arctan(−2)?
Answer
arctan(−2) ≈
−63.4349° ≈ −1.1071 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.
arctan(−2) is the angle α in (−90°, 90°) with tan α = −2.
arctan(−2) = −arctan(2) ≈ −63.4349°
tan(−63.4349°) ≈ −2.0000
α = arctan(−2) ≈ −63.4349°
P ≈ (0.4472, −0.8944)
T(1, −2) is where line OP meets the line x = 1; highlighted: tan α = −2.
| Function | Degrees | Radians |
|---|---|---|
| arcsin(−2) | does not exist | — |
| arccos(−2) | does not exist | — |
| arctan(−2) | ≈ −63.4349° | ≈ −1.1071 |
| arccot(−2) | ≈ 153.4349° | ≈ 2.6779 |
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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 |
|---|---|
| −3 | ≈ −71.5651° |
| −2 | ≈ −63.4349° |
| −√3 | −60° = −π/3 |
| −4/3 | ≈ −53.1301° |
| −1 | −45° = −π/4 |
| −4/5 | ≈ −38.6598° |
| −√3/3 | −30° = −π/6 |