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Online Calculators & Tools
Arccos Calculator
arccos(x) = cos-1(x)
Arccos rules
| Rule name | Rule |
|---|---|
| Cosine of arccosine | cos( arccos x ) = x |
| Arccosine of cosine | arccos( cos x ) = x + 2kπ, when k∈ℤ (k is integer) |
| Arccos of negative argument | arccos(-x) = π - arccos x = 180° - arccos x |
| Complementary angles | arccos x = π/2 - arcsin x= 90° - arcsin x |
| Arccos sum | arccos(α) + arccos(β) = arccos( αβ - √(1-α2)(1-β2) ) |
| Arccos difference | arccos(α) - arccos(β) = arccos( αβ + √(1-α2)(1-β2) ) |
| Arccos of sin of x | arccos( sin x ) = -x - (2k+0.5)π |
| Sine of arccosine |  |
| Tangent of arccosine |  |
| Derivative of arccosine |  |
| Indefinite integral of arccosine |  |
Arccos table
| x | arccos(x) | |
|---|---|---|
| degrees | radians | |
| -1 | 180° | π |
| -0.8660254 | 150° | 5π/6 |
| -0.7071068 | 135° | 3π/4 |
| -0.5 | 120° | 2π/3 |
| 0 | 90° | π/2 |
| 0.5 | 60° | π/3 |
| 0.7071068 | 45° | π/4 |
| 0.8660254 | 30° | π/6 |
| 1 | 0° | 0 |