The limit expression is .

(a)

.

.

(b)

Consider

Apply LHospitals Rule.

LHospitals Rule: If or then .

.

Therefore, .

(c)

Graph :

Graph the function .

Observe the graph:

As approaches to from right hand side, the function approaches to .

(a) .

(b) .

(c) Graph of the function is

.