(2√3 + 3√5)( 2√3 - 2√5)
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= (2✓3)² + 2✓3(-2✓5) + 3✓5(2✓3) + 3✓5(-2✓5)
= 12 - 4✓15 + 6✓15 - 30
= 2✓15 - 18
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