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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.’