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let a = 1+sqrt7+sqrt8. I want to show that Q[sqrt2] is a subset of Q(a) and I know that b=(a-1)^3= 31sqrt7+58sqrt2
let a = 1+sqrt7+sqrt8. I want to show that Q[sqrt2] is a subset of Q(a) and I know that b=(a-1)^3= 31sqrt7+58sqrt2
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