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1/[5 + 3*sqrt(2)] = [5 - 3*sqrt(2)]/{[5 + 3*sqrt(2)][5 - 3*sqrt(2)]}

= [5 + 3*sqrt(2)]/[25 - 18] = [5 - 3*sqrt(2)]/7

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Q: What is the multiplicative inverse of 5 plus 3 square root of 2?
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