Áireamhán Arccos (x) . Áireamhán cosine inbhéartach.
Is í an fheidhm arccosine feidhm inbhéartach cos (x).
arccos ( x ) = cos -1 ( x )
Mar shampla, Más é 0.5 an cosine 60 °:
cos (60 °) = 0.5
Ansin is é 60 ° an arccos 0.5:
arccos (0.5) = cos -1 (0.5) = 60 °
| x | arccos (x) | |
|---|---|---|
| céimeanna | raidianacha | |
| -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 |
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