WithoutTheDestination​(AngouriMath.​Entity)

A part's limit with the destination folded out of it. A one-sided limit at a finite
point moves the variable out to infinity, and the value read off there keeps the
infinity in it: x^2 + x - 1 from the left at 0 is -1 - 1/+oo + 1/+oo^2, which is -1
but is not finite to the check above, so sin(x^2 + x - 1) from the left at 0 was left
unevaluated. Only for the trigonometric functions, which have no cut, and so are
continuous at every finite argument short of a pole. A function with a cut is not:
arctan and the logarithm decline there by their own reading, and folding their
argument's limit would answer with the value on the cut.