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If the equation x^(2)+2hxy+2fy+c=0 repre...

If the equation `x^(2)+2hxy+2fy+c=0` represents a pair of lines, then

A

`f^(2)+ch=0`

B

`f^(2)+ch^(2)=0`

C

`f^(2)-ch^(2)=0`

D

`f^(2)-c^(2)h^(2)=0`

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