Find the product using suitable identity.
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(x+1/x)(x-1/x)(x^2+1/x^2)(x^4+1/x^4)
{x^2-1/x^2}{x^2+1/x^2}{x^4+1/x^4}
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x^8-1/x^8
{x^2-1/x^2}{x^2+1/x^2}{x^4+1/x^4}
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x^8-1/x^8
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