Подстановка условия
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$$\operatorname{acot}{\left(x \right)}$$
$$\operatorname{acot}{\left(x \right)}$$
$$x = - \frac{1}{3}$$
$$\operatorname{acot}{\left((-1/3) \right)}$$
$$\operatorname{acot}{\left(- \frac{1}{3} \right)}$$
$$- \operatorname{acot}{\left(\frac{1}{3} \right)}$$