In this tutorial we give the statements of theorems on limits which will be useful in evaluating the limits.

**(1)** The limit of a function, if exists is unique.

**(2)** If and are any constants then, .

**(3)** If is a constant, then for any number , .

**(4)** For any constant and , we have

**(5)**The limit of the sum of two functions is equal to the sum of their limits, i.e. and , then

**(6)**The limit of the difference of two functions is equal to the difference of their limits, i.e. and , then

**(7)**The limit of the product of two functions is equal to the product of their limits, i.e. and , then

**(8)**The limit of the quotient of two functions is equal to the quotient of their limits provided the limit of the denominator is nonzero, i.e. and , then

**(9)**If is any integer and , then

__Sandwich Theorem__**:**

If for all numbers in some open interval containing a except possibly at a itself such that

then