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The arcsine function returns a number in degrees for any given argument. It works reverse to the sine function. It assumes the argument to be a sine and returns a number in degree. So when the argument is 1 the function returns 90, since the sine of 90 is 1.
For arguments greater than 1 returns also 90 since a sine with a value greater than 1 does not exist.
For arguments smaller than -1 the function returns -90 since a sine with a value smaller than -1 does not exist.
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