| π | ||
Rozwiąż nierówność 2cos(x− | )≤−√2 | |
| 4 |
| 3π | 3π | |||
czerwone kropki to x1 = − | x2 = | |||
| 4 | 4 |
| π | ||
cos(x− | ) ≤ −U{√2}π{2} ⇔ | |
| 4 |
| π | 3π | |||
−π+2kπ ≤ x− | ≤ − | +2kπ | ||
| 4 | 4 |
| 3π | π | ||
+2kπ ≤ x− | ≤ π+2kπ | ||
| 4 | 4 |
| 3π | π | |||
− | +2kπ ≤ x ≤ − | +2kπ | ||
| 4 | 2 |
| π | ||
π+2kπ ≤ x ≤ | +π+2kπ | |
| 4 |
| 3π | π | |||
− | +2kπ ≤ x ≤ − | +2kπ | ||
| 4 | 2 |
| π | ||
(2k+1)π ≤ x ≤ | +(2k+1)π | |
| 4 |