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The equation of common tangent to the curves y 2 = 16x and xy = –4, is :

1. x – y + 4 = 0
2. x + y + 4 = 0
3. x – 2y + 16 = 0
4. 2x – y + 2 = 0

Correct answer: x – y + 4 = 0

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