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If the pairs of straight lines `ax^(2)+2hxy-ay^(2)=0` and `bx^(2)+2gxy-by^(2)=0` be such that each bisects the angles between the other, then

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If the pairs of straight lines `ax^(2)+2hxy-ay^(2)=0` and `bx^(2)+2gxy-by^(2)=0` be such that each bisects the angles between the other, then
A. `hg+ab=0`
B. `ah+bg=0`
C. `h^(2)=ab`
D. `ag+bh=0`
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Correct Answer - A
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