factorise:-
• x²+{(a²+1)/a}+1
• x⁴+y⁴-27x²y²
• 4x⁴ +9y⁴+11x²y²
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Answer:
(x-1/a)(x-a)
(x²-y²)-(3xy)²
(x²+y²)(4x²+9y²)
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