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If ax^2+2hxy+by^2+2gx+2fy+c=0 represents...

If `ax^2+2hxy+by^2+2gx+2fy+c=0` represents two parallel lines then prove that the distance between the parallel lines is `2sqrt((g^2-ac)/(a(a+b)))" or "2sqrt((f^2-bc)/(b(a+b)))`.

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The correct Answer is:
`2sqrt((f^2-ac)/(b(a+b)))`
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