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4-13.

Simplify each of the expressions below. Express your answers as simply as possible.

Factor the polynomials, simplify, and then multiply.

Factor the polynomials, simplify, and then divide.

Two of the polynomials have common factors.

Both fractions already have a common denominator, so add the fractions and then simplify by factoring.

Both fractions have a common denominator, so subtract the fractions.