cotθ=-2,quadsecθ<0 шешу

$$\cot \theta = - 2 , \quad \sec \theta < 0$$

θ теңдеуін шешу

$$\theta \in \mathrm{R}$$

$$\exists n_{2}\in \mathrm{Z}\text{ : }\theta =2\pi n_{2}-\arcsin(\frac{\sqrt{5}}{5})+\pi \text{ and }\exists n_{3}\in \mathrm{Z}\text{ : }\left(\theta >\frac{\pi \left(4n_{3}-3\right)}{2}\text{ and }\theta <\frac{\pi \left(4n_{3}-1\right)}{2}\right)\text{ and }\nexists n_{1}\in \mathrm{Z}\text{ : }\theta =\pi n_{1}$$