General equation
Concept 8 of 9 in Pair of Straight Lines
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x2−4y2+4y−1=0x^2 - 4y^2 + 4y - 1 = 0x2−4y2+4y−1=0 and x2−4y2+4y+1=0x^2 - 4y^2 + 4y + 1 = 0x2−4y2+4y+1=0 differ only in the constant. Which one is a pair of straight lines?
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