For example, see 2x⁴ + 3x² – 5 as its factors (x² – 1) and (2x² + 5); see x⁴ – y⁴ as (x²)² – (y²)², thus recognizing it as a difference of squares that can be factored as (x² – y²) (x² + y²); see (x² + 4)/(x² + 3) as ...

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