factorise p^4 - (p-q)^4
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Answer:
p⁴ - (p - q)⁴
(p²)² - {(p - q)²}²
using a² - b²= (a + b)(a + b)
(p² - p² + q²)(p² + p² + q²)
q²(p² + p² + q²)
q²(2p² + q²)
2p²q² + q⁴ is the answer
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