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-60 √2 1- √2 -60 √2+120 -60( √2-2)
-------*----------=--------------= -------------- = 60( √2-2)
1+ √2 1- √2 1-2 -1
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-60 √2 1- √2 -60 √2+120 -60( √2-2)
-------*----------=--------------= -------------- = 60( √2-2)
1+ √2 1- √2 1-2 -1