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For a point P in the plane, let d1(P) and d2(P) be the distances of the point P from the lines x - y = 0 and x + y = 0 respectively. The area of the region R consisting of all points P lying in the first quadrant of the plane and satisfying 2 ≤ d1(P) + d2(P) ≤ 4, is ________

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= 8 - 2 = 6 sq. units

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