aswwer for brain list
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5x=4y
by alternando,x/y=4/5
squaring,x^2/y^2=16/25
multiply by 3, 3x^2/3y^2=48/75
by componendo-divedendo,
3x^2+y^2/3x^2-y^2=48+25/48-25
3x^2+3y^2/3x^2-y^2=73/23
by alternando,x/y=4/5
squaring,x^2/y^2=16/25
multiply by 3, 3x^2/3y^2=48/75
by componendo-divedendo,
3x^2+y^2/3x^2-y^2=48+25/48-25
3x^2+3y^2/3x^2-y^2=73/23
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