,2020 +1 4. Calculate the integral z=1 dz. 23 5. Suppose u(x, y) = x² + xy - y². Find an analytic function f(z) whose re
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,2020 +1 4. Calculate the integral z=1 dz. 23 5. Suppose u(x, y) = x² + xy - y². Find an analytic function f(z) whose real part is exactly the function u(x, y).
,2020 +1 4. Calculate the integral z=1 dz. 23 5. Suppose u(x, y) = x² + xy - y². Find an analytic function f(z) whose real part is exactly the function u(x, y).