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multiply.

(a^2-b^2)(a^2-b^2)

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- Multiply

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**Answer:**

(a^2-b^2)(a^2-b^2)

= a^2(a^2-b^2)-b^2(a^2-b^2)

= a^4-a^2b^2-a^2b^2+b^4

= a^4-2a^2b^2+b^4

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