sqrt
Math.sqrt( aNumeric ) -> aFloat
Returns the non-negative square root of aNumeric. Raises ArgError if aNumeric is less than zero.

tan
Math.tan( aNumeric ) -> aFloat
Returns the tangent of aNumeric (expressed in radians).

_id2ref
ObjectSpace._id2ref( anId ) -> anObject


Converts an object id to a reference to the object. May not be called on an object id passed as a parameter to a finalizer.

s = "I am a string" » "I am a string"
r = ObjectSpace._id2ref(s.id) »"I am a string"
r == s »true

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