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Find the area of the region enclosed between the two circles x2 + y2 = 1 and (x - 1)2 + y2 = 1.

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We have, 

x2 + y2 = 1 ...........(i)

and (x - 1)2 + y2 = 1......(ii)

From eqns. (i) and (ii), we get points of intersection as :

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And where is C in the diagram

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