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Mathematics 21 Online
OpenStudy (anonymous):

Consider the surface 1 x^2 + 16 y^2 + 16 z^2 = 33 and the point P = ( 1, 1, 1 ) on this surface. a) The outward unit normal at the point P is I + J + K. b) The equation of the tangent plane at the point P is z = ??? x + ??? y + ??? .

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