<html><head><meta name="color-scheme" content="light dark"></head><body><pre style="word-wrap: break-word; white-space: pre-wrap;">Zjistěte $f(A)$, kde $f(z)=(z+1/z)/2$ pro množiny

a) $A=\{z \in \Bbb C: z=e^{it}, t \in [0,2\pi]\}$ ,

b) $A=\{z \in \Bbb C: z=t, t \in (0,\infty)\}$ .
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