A rectangular sheet of paper ABCD is with width AD=1 and length AB more than the width but not more than double of it. The paper is folded through vertex A so that the edge along AD falls onto AB. Without unfolding, the paper is folded again along a line through B so that CB now lies on AB. Now the result is a triangular piece of paper. There is a region on this triangular sheet that has four layers of paper. Find the area of that region in terms of the length x, of the rectangle.
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The solution is here
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