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Introduction to complex analysis

Completion requirements

The figure shows Cartesian axes labelled x and y. It is focused on the upper half-plane. The graph of the function y equals the modulus of x is drawn and labelled. In the upper-left quadrant the graph is a line sloping down with gradient negative 1 to the origin. In the upper-right quadrant the graph is a line sloping up with gradient 1 from the origin.