反余弦计算器 — 公式

Inverse Cosine (Arccos)

Definition

arccos(x) = the angle whose cosine is x

Domain and Range

  • Domain: -1 ≤ x ≤ 1
  • Range: 0° to 180° (0 to pi radians)

    • Common Values

  • arccos(1) = 0°
  • arccos(0.5) = 60°
  • arccos(0) = 90°
  • arccos(-1) = 180°

    • 计算示例

    Find arccos(0.5).

    1. arccos(0.5) = pi/3 radians
    2. = 60 degrees
    3. Verification: cos(60°) = 0.5