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QUESTION
(3 points) Find the points at which the graph of the equation 4x2 +1.2 -8x+4y+4=0 has a vertical or horizontal tangent line.
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l. (3 points) Find the points at which the graph of the equation4x2 +1.ยป2 -8x+4y+4=0 has a vertical or horizontal tangent line.