<html><head><meta name="color-scheme" content="light dark"></head><body><pre style="word-wrap: break-word; white-space: pre-wrap;">Vy\v set\v rete pr\accent23ub\v eh  funkc\' \i :
$$ f_1(x) = \arccos( \frac{1 - x^2}{1 + x^2}),
   f_2(x) = \vert \arcsin( \frac{2x}{1 + x^2} ) \vert,$$
$$ f_3(x) = \arcsin( \frac{2x}{1 + x^2} ) + \vert x - 1 \vert,
   f_4(x) = \arcsin(\vert \frac{1 - x}{1 - 2x}\vert ).$$
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