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One sided limits are also used here. A variable approaches a fixed point either from above or below.

Example: x → 3+ or x → 3 -

Limit of a function can be found by comparison with two other functions. This is the squeeze theorem.

Example 1:

(a) 0 (b) 1 (c) Not defined (d) 1/2

Answer: d

Explanation:

Example 2:

(a) 1 (b) 0 (c) Not defined (d) -2

Answer: