(a)

Find .

Take out the term from the numerator and term from the denominator.

As , then .

Evaluate the limits.

Therefore, .

(b)

Find .

Take out the term from both the numerator and the denominator.

As , then .

Evaluate the limits.

Therefore, .

(c)

Find .

Take out the term from the numerator and term from the denominator.

As , then .

Evaluate the limits.

Therefore, .

(a) .

(b) .

(c) .