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4. Find the points at which the graph of 4x2 + y2 8x + 4y + 4 = 0 has a vertical tangent line. 5.

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4. Find the points at which the graph of 4x2 + y2 8x + 4y + 4 = 0 has a vertical tangent line. 5. Find the points at which the graph of x2 + xy + y2 = 6 has a horizontal tangent line

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