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12) Show that the equation x2 + y2 + z2 -10x + 2y + 8z =9 represents a sphere. Find its center and radius. 13)

12) Show that the equation x2 + y2 + z2 -10x + 2y + 8z =9 represents a sphere. Find its center and radius. 13) If vector u = and vector v = , find the angle between them

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