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Show the complete solution: Find the center and radius of x^2 + y^ 2 + z^2 + 2x + 3y + 4z + 1 =

Show the complete solution:

Find the center and radius of x^2 + y^ 2 + z^2 + 2x + 3y + 4z + 1 = 0.

Find the angle between the two vectors u and v where u = 2i + j and v = 3i + 4j.

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