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√8+3/√8-3 - √8-3/√8+3
(√8+3/√8-3 × √8+3/√8+3) - (√8-3/√8+3 × √8-3/√8-3)
we get
(8+ 9+ 6√8/8-9)-(8+9- 6√8/8-9)
17+6√8/1-17+6√8/1
=12√8
(√8+3/√8-3 × √8+3/√8+3) - (√8-3/√8+3 × √8-3/√8-3)
we get
(8+ 9+ 6√8/8-9)-(8+9- 6√8/8-9)
17+6√8/1-17+6√8/1
=12√8
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