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[" The angle between the diagonals of a "],[" quadritateral formed by the lines "(x)/(a)+(y)/(b)=1],[(x)/(h)+(y')/(a)=1,(x)/(a)+(y)/(b)=2,quad (x)/(b)+(y)/(a)=2" is "],[[" (1) "(pi)/(4)," (社 "]],[[4," (社 "]]

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