One of the mysteries of the English language finally explained.
A mathematical function that is the inverse of the cosine function.
- ‘The arc cosine is the angle whose cosine is the specified number.’
- ‘The inverse functions of the sine and the cosine are called the arc sine arcsin and the arc cosine arccos, respectively.’
- ‘The following example returns the arc cosine of the value in radians.’
- ‘These functions compute the hyperbolic sine, cosine, tangent, arc sine, arc cosine, and arc tangent functions, which are mathematically defined for an argument x as given in the next figure.’
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