1. The inverse function of the cosine function; the angle whose cosine is a given number.
Usage: mathematics; Also written as arccos or cos⁻¹

Examples

• The arccosine of 0.5 is approximately 60 degrees or π/3 radians.
• To find the angle, we need to calculate the arccosine of the ratio of the adjacent side to the hypotenuse.
• In trigonometry, arccosine is used to solve equations where the cosine value is known but the angle is unknown.
• The domain of the arccosine function is restricted to values between -1 and 1.
• Students learn that arccos(1) equals 0 radians.