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prove that the equation of the plane tangent to the sphere x^2 + y^2 + z^2...

prove that the equation of the plane tangent to the sphere x^2 + y^2 + z^2 = a^2 at the point (x0, y0, z0) on the sphere is x*x0 + y*y0 + z*z0 = a^2

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