factorise
x^4 - 16 y^4
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Answer:
x⁴-16y⁴
→(x²-4y²)²
By identity (a-b)²=a²+b²-2ab
→(x²)²+(4y²)²-2(x²)(4y²)
→x⁴+16y⁴-8x²y²
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