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If the equation `7x^(2)-kxy-7y^(2)=0` represents the bisectors of angles between the lines `2x^(2)-7xy+4y^(2)=0` then: `k=`

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If the equation `7x^(2)-kxy-7y^(2)=0` represents the bisectors of angles between the lines `2x^(2)-7xy+4y^(2)=0` then: `k=`
A. 2
B. 3
C. -3
D. 4
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Correct Answer - D
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