√ (8 - 2 * √ 15) = √ (5 - 2 * √ 5 * √ 3 + 3) = √ (√ 5 - √ 3)² = √ 5 - √ 3
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√ (8 - 2 * √ 15) = √ (5 - 2 * √ 5 * √ 3 + 3) = √ (√ 5 - √ 3)² = √ 5 - √ 3