Mister Exam

ln|y|=arctg(x)+c canonical form

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The solution

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-c - atan(x) + log(|y|) = 0
$$- c + \log{\left(\left|{y}\right| \right)} - \operatorname{atan}{\left(x \right)} = 0$$
-c + log(|y|) - atan(x) = 0