factorise
x⁴-13x²y²+4y⁴
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Ans x⁴-13x²y²+4y⁴
x⁴-9x²y²+4x²y²+4y⁴
x²(x²- 9y²) 4y²(x² +9y²)
(x²+4y²)(x²-9y²)
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