Vy\v set\v rete pr\accent23ub\v eh  funkc\' \i :
$$ f_1(x) = \arctan (x^2), f_2(x) = \arcsin (\frac{1}{x}),$$
$$ f_3(x) = \text{arccotg} (\frac{1}{x^2}), f_4(x) = \arctan (\sqrt{\ln x}).$$
