Question: Use a graphing utility to graph the curve 5x 2 2xy + 5y 2 = 8. Draw the tangent line to the curve at

Use a graphing utility to graph the curve 5x² − 2xy + 5y² = 8. Draw the tangent line to the curve at (1, 1). How many horizontal tangent lines does the curve have? Find the equation of each horizontal tangent.

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