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Write the product and simplify for

Solution:
The given equation above is another good example of special products where a binomial multiplied by another binomial where the terms are rational functions. In this case, we have to do the distribution property of multiplication over addition as follows
The LCD (Least Common Denominator) of the three fractions is (x + y)2(a + b)2. Rewrite the three fractions in terms of their LCD and simplify, we have
Since all the terms of the numerator cannot be combined and simplified, then we can leave the final answer as is.