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a x + b y + c_{1} = 0

a x + b y + c_{2} = 0

| \frac{c_{1} + c_{2}}{\sqrt{a^{2} + b^{2}}} |

| \frac{c_{1} - c_{2}}{\sqrt{a^{2} + b^{2}}} |

| \frac{c_{1} + c_{2}}{\sqrt{a^{2} - b^{2}}} |

| \frac{c_{1} - c_{2}}{\sqrt{a^{2} - b^{2}}} |

ANS : 2

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