Question

if a-1/a=3, find the value of a^2-1/a^2 by using the hint {(a+1/a)^2=(a-1/a)^2+4a.1/a=3^2+4=13. :a+1/a=√13. now (a+1/a)(a-1/a)=√13*=3√13.}​

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