13. Simplify by using algebraic identities.\begin{array}{l}{(x+y)(x-y) – InterviewSolution

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1.	13. Simplify by using algebraic identities.\begin{array}{l}{(x+y)(x-y)\left(x^{2}+y^{2}\right)} \\ {(p+q)^{2}-(p-q)^{2}} \\ {(r+s)^{2}-(r+s)(r-s)}\end{array}
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