1/ 3x^2-4y^2=8 x^2+4y^2=8 .
2/ [20,3] 36 .
3/ [2,4] .
1/ 3x^2-4y^2=8 x^2+4y^2=8 .
2/ [20,3] 36 .
3/ [2,4] .
: 1 (0 1 )
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