Factor by Grouping x^2-26x+169-y^2

Factor using the perfect square rule.
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Rewrite as .
Check the middle term by multiplying and compare this result with the middle term in the original expression.
Factor using the perfect square trinomial rule , where and .
Since both terms are perfect squares, factor using the difference of squares formula, where and .
Factor by Grouping x^2-26x+169-y^2

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