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प्रश्न
Choose the correct alternative:
If the lines represented by the equation 6x2 + 41xy – 7y2 = 0 make angles α and β with x-axis then tan α tan β =
पर्याय
`- 6/7`
`6/7`
`- 7/6`
`7/6`
उत्तर
`- 6/7`
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