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3(2/y)^2 - y^2 = 4
12/y^2 - y^2 = 4
y^4 + 4y^2 - 12 = 0
(y^2 +6)(y^2 - 2)+ 0
y^ 2= -6 (TM) atau y^2 = 2 --> y = √2 atau y = -√2
x= 2/y --> y= √2 maka x = √2
y = - √2 maka x = -√2