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2014-09-12T22:30:05+03:00
5) (1+ \sqrt{5- \sqrt{3} } )(1- \sqrt{5- \sqrt{3} } )+(1- \sqrt{7+ \sqrt{3} } )(1+ \sqrt{7+ \sqrt{3} } )=1-5- \sqrt{3} +1-7+ \sqrt{3} =2-12=-10