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The normals to the curve x = a (theta + sin theta), y = a (1 – cos theta) at the points theta = (2n + 1) pi, n element of I are all -

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  1. parallel to the line y = x    
  2. parallel to x-axis    
  3. parallel to y-axis    
  4. None of these    

    Answer:The correct answer is: parallel to x-axis

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