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Mathematics · Coordinate Geometry

If the second-degree equation x2 - y2 + z2 - 4x + 2y + 6z + λ = 0 represents a cone, then the value of λ is:

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If the second-degree equation x2 - y2 + z2 - 4x + 2y + 6z + λ = 0 represents a cone, then the value of λ is:

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