\frac { d x } { x } = \tan y \cdot d y
Gjej d
\left\{\begin{matrix}d=0\text{, }&x\neq 0\text{ and }\nexists n_{1}\in \mathrm{Z}\text{ : }y=\pi n_{1}+\frac{\pi }{2}\\d\in \mathrm{R}\text{, }&-y\sin(y)+\cos(y)=0\text{ and }x\neq 0\text{ and }\nexists n_{1}\in \mathrm{Z}\text{ : }y=\frac{\pi \left(2n_{1}+1\right)}{2}\end{matrix}\right.
Gjej x
x\neq 0
\left(d=0\text{ and }\nexists n_{1}\in \mathrm{Z}\text{ : }y=\frac{\pi \left(2n_{1}+1\right)}{2}\right)\text{ or }\left(-y\sin(y)+\cos(y)=0\text{ and }\nexists n_{1}\in \mathrm{Z}\text{ : }y=\frac{\pi \left(2n_{1}+1\right)}{2}\right)
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