Answer 4.4:8
From Förberedande kurs i matematik 1
| a) | \displaystyle \left\{\eqalign{
x&=\displaystyle \frac{\pi}{4}+2n\pi\cr x&=\displaystyle \frac{\pi}{2}+n\pi\cr x&=\displaystyle \frac{3\pi}{4}+2n\pi }\right. | b) | \displaystyle x=\displaystyle \frac{\pi}{3}+n\pi |
| c) | \displaystyle \left\{\eqalign{
x&=n\pi\cr x&=\displaystyle \frac{3\pi}{4}+n\pi }\right. |
