In each of the following cases, define a parametrised curve y : [a, b] → C whose image * is: (a) The closed semi-circle of radius R in the right half-plane. (b) The equilateral triangle with vertices 1,-1, iv3. (c) The two circles {z € C; |z – 1| = 1}U{z € C; |z+ 1| = 1}.

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