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Equation of a common tangent to the parabola y 2 = 4x and the hyperbola xy = 2 is

1. x + y + 1 = 0
2. 4x + 2y + 1 = 0
3. x – 2y + 4 = 0
4. x + 2y + 4 = 0

Correct answer: x + 2y + 4 = 0

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