If the angle of intersection of the sphere x^2 + y^2 + z^2 - 2x -4y- 6z+10 = 0 with the sphere, the extremities

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Q 2117023880.     If the angle of intersection of the sphere

x^2 + y^2 + z^2 - 2x -4y- 6z+10 = 0 with the

sphere, the extremities of whose diameter are

(1, 2, - 3) and (5, 0, 1) is cos^(-1) (lambda), then the value

of 9999 | lambda |  must be

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