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Find k, if the equation 2x^(2) + kxy - 6...

Find k, if the equation `2x^(2) + kxy - 6y^(2) + 3x + y + 1 = 0` represents a pair of lines. Find the point of intersection of the lines and angle between the lines for this value of k.

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The correct Answer is:
`alpha="cos"^(-1)((1)/(sqrt(5)))`
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