solve quesrion number 18
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x^2+1/x^2=66
x^2+1/x^2+2*x*1/x=66
x^2-1/x^2+2=66
x^2-1/x^2=64
x-1/x=8
x^3-1/x*3=(x-1/x)(x^2+1/x^2+x*1/x)
=(8)(64+1)
=73
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