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This figure consists of a diagram of the complex plane, focused on the right half-plane. The axes are not labelled. A line segment extends from the origin to a point in the lower-right quadrant. The point is marked with a solid dot and labelled z minus alpha. A second line segment extends from the origin to a point in the upper-right quadrant. The second line segment is longer than the first. Above it is the text, scale by the modulus of f prime of alpha. The point at the end of the second line segment is marked with a solid dot and labelled f prime of alpha times open bracket, z minus alpha, close bracket. A curved arrow between the two line segments points in the anticlockwise direction. Next to it is the text, rotate by Arg f prime of alpha.