(a)

If , then tends to , approaches to .

denotes the value of any particular function at .

The function is a continuous, and may or may not be at .

then we cannot conclude that limit as tends to , approaches to .

(b)

As limit tends to , approaches to then we cannot say that .

(a) If , cannot conclude the value of as limit tends to .

(b) As limit  tends to , approaches to , then cannot conclude the value of .