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प्रश्न
The angle between the pair of straight lines x2 – 7xy + 4y2 = 0 is:
पर्याय
`tan^-1 (1/3)`
`tan^-1 (1/2)`
`tan^-1 (sqrt33/5)`
`tan^-1 (5/sqrt33)`
उत्तर
`tan^-1 (sqrt33/5)`
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