(x - 0)^2 + (y - 1)^2 + (z - 3)^2 = 1^2
x^2 + y^2 + z^2 - 2y - 6z + 9 = 0
Ponendo x = y = 0
z^2 - 6z + 9 = 0
(z - 3)^2 = 0
z - 3 = 0
z = 3
P = (0,0,3)
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