rozwiąż równania:
a) cos (2x − π/6) − cos (x + π/6) = 0
b) tg2x = tg (3x − π/6)
| π | π | |||
cos(2x − | ) = cos(x + | ) | ||
| 6 | 6 |
| π | π | π | π | |||||
2x − | = x + | + k*2π lub 2x − | =−x − | + k*2π | ||||
| 6 | 6 | 6 | 6 |
| π | π | π | ||||
2x ≠ | + k*π ⇒ x ≠ | + k* | ||||
| 2 | 4 | 2 |
| π | π | π | π | |||||
3x − | + k*π ⇒ 3x ≠ | + k*π ⇒ x ≠ | + k* | |||||
| 6 | 6 | 18 | 3 |
| π | ||
2x = 3x − | + k*π ⇒ x = ... dokończ | |
| 6 |