factorise :
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Step-by-step explanation:
→ x^4+x^2+1
→ (x^2+1)^2-x^2
→ (x^2+1-x)(x^2+1+x)
→ (x^2-x+1)(x^2+x+1)
→ (x^2+x+1)(x^2-x+1)
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