Step 1:

The function is .

The function is continuous and differentiable at .

(I)

A function is said to be continuous at if and only if

Consider .

Consider .

The function is continuous at .

                          equation (1)

Step 2:

A function is said to be differentiable at if and only if

Consider

Consider .

The function is differentiable at .

Step 3:

Substitute in equation (1).

Substitute and in the function .

Solution:

and .