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2014-08-26T12:53:15+03:00
=√2/√3*1/√6 + √3/√2*1/√6 + 1/√6*1/√6= 1/(√3*√3) + 1/(√2*√2) + 1/(√6*√6)=1/3+1/2+1/6= (2+3+1)/6=1