Factorise :
1. (x² - y²)z + (y² - z²)x
2. p² - (a + 2b)p + 2ab
3. x³ - x² - xy + x + y - 1
4. a¹²x⁴ - a⁴x¹²
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just reply (a²_b²)c + (b²_c²)a
thank you:)
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