10.6.20 Analytic Functions
(3) Condition: taking advantage of the conditions of Koshi-Riman, find out whether this is an analytical function or not at least at one point: \ [z \ cos \ bar {z} \]
Differentiation of Analytic Functions, Finding Their Real and Imaginary Parts, Finding the Number of Roots Equates Using the Argement Principle, Roucher's Theorem and Much More in this space.