Answer
f(x, y, z) = x^2+y^2+z^2 = 1
Work Step by Step
c\geq0
c=0, x^2+y^2+z^2 =0 O(0, 0, 0)
c=1, x^2+y^2+z^2 =1, r=1
c=4, x^2+y^2+z^2 =4, r=2
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