Determine the lines represented by the equation x2+2xy+y2-2x-2y-15=0
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intersecting lines. ... through the origin, each of which makes an angle α with the straight line y = x is x2 − 2xy sec 2α + y2 = 0 Solution.
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Determine the lines represented by the equation x2+2xy+y2-2x-2y-15=0
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