20. If x=
5-√21/2,then prove that(x^3+1/x^3)^-5(x^2+1/x^2)+(x+1/x)=0.​

20. If x=
5-√21/2,then prove that(x^3+1/x^3)^-5(x^2+1/x^2)+(x+1/x)=0.​

1 thought on “20. If x=<br />5-√21/2,then prove that(x^3+1/x^3)^-5(x^2+1/x^2)+(x+1/x)=0.​”

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