Решете 2cosθ+sinθ=3/2secθtext{for}0<θ<2pi

$$2 \cos \theta + \sin \theta = \frac { 3 } { 2 } \sec \theta \text { for } 0 < \theta < 2 \pi$$

Реши за f

$$\left\{\begin{matrix}f\in \mathrm{R}\text{, }&\theta >0\text{ and }\theta <2\pi \\f=\frac{2\cos(\theta )\left(\sin(\theta )+2\cos(\theta )\right)}{3}\text{, }&\nexists n_{1}\in \mathrm{Z}\text{ : }\theta =\pi n_{1}+\frac{\pi }{2}\end{matrix}\right,$$