Given that, x-1x=5 =(x-1x)2=(5)2 =(x+1x)2-4×x×1x=5 (x+1x)=5+4=9 ∴x1x=3
প্রদত্ত রাশি, x3+1x3=(x+1x)3-3×x×1x(x+1x)
=33-3×3 =27-9 =18
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