[0,1(6)]^2 = [16-1/90]^2 = (15/90)^2 = (1/6)^2 = 1/36
[ 0 , 1 ( 6 ) ]² = 1 / 36
0 , 1 ( 6 ) = ( 16 - 1 ) / 90 = 15 / 90 = 1 / 6 ( am simplificat fractia cu 15 )
→ ( 1 / 6 )² = 1 / 36
