# Which of the following is x⁴ + y⁴ identically equal to? (A) (x² + y²)(x + y)(x - y) (B) (x² + xy + y²)(x² - xy + y²) (C) (x² + √2xy + y²)(x² - √2xy + y²) (D) (x² + √3xy + y²)(x² - √3xy + y²) (E) (x + y)²(x-y)² Can someone explain me how to make it step by step?

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