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The arccosine function returns a number in degrees for any given argument. It works reverse to the cosine function. It assumes the argument to be a cosine and returns a number in degree. So when the argument is 1 the function returns 0, since the cosine of 0 is 1.
For arguments greater than 1 or smaller than -1 the function returns also 0 since a cosine with a value greater than 1 or smaller than -1 does not exist.
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