By defenition of the sphere, the equation is
(x−cx)2+(y−cy)2+(z−cz)2=r2,(x-c_x)^2+(y-c_y)^2+(z-c_z)^2=r^2,(x−cx)2+(y−cy)2+(z−cz)2=r2, or
(x−h)2+(y−k)2+(z−l)2=r2.(x-h)^2+(y-k)^2+(z-l)^2=r^2.(x−h)2+(y−k)2+(z−l)2=r2.
Answer: (x−h)2+(y−k)2+(z−l)2=r2.(x-h)^2+(y-k)^2+(z-l)^2=r^2.(x−h)2+(y−k)2+(z−l)2=r2.
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