acos

Inverse cosine (radians).

Syntax

Y = acos(X)

Description

Returns the angle whose cosine is X, in radians, in [0, π]. X must be in [-1, 1].

Example

acos(0)                    % π/2

See also

• acosd — Inverse cosine (degrees).
• acosh — Inverse hyperbolic cosine.
• cos — Cosine (radians).
• asin — Inverse sine (radians).