Question: At what points does the curve defined by x2 + 4y2 - 4x - 4 = 0 have (a) Horizontal tangents? (b) Vertical tangents?

At what points does the curve defined by x2 + 4y2 - 4x - 4 = 0 have
(a) Horizontal tangents?
(b) Vertical tangents?

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