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[" 4.The equations "x-y=4" and "x^(2)+4x...

[" 4.The equations "x-y=4" and "x^(2)+4xy+y^(2)=0" represent the "],[" sides of "],[[" (1) an equilateral triangle "," (2) a right-angled triangle "],[" (3) an isosceles triangle "," (4) none of these "]]

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