1/(√3+1) = ?
1/(√3+1)=1/(√3+1)*(√3+1)/(√3+1)=1(√3+1)/1
=√3+1
1/√3+1=1/√3+1 x √3-1/√3-1=1-√3/2
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1/(√3+1)=1/(√3+1)*(√3+1)/(√3+1)=1(√3+1)/1
=√3+1
1/√3+1=1/√3+1 x √3-1/√3-1=1-√3/2