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Find the points on the sphere x^2 + y^2 + z^2 = 25 where f(x,y,z) = x + 2y + 3z has its maximum and

Find the points on the sphere x^2 + y^2 + z^2 = 25 where f(x,y,z) = x + 2y + 3z has its maximum and minimum values.

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