| π | π | |||
cos(x − | ) = −cos | |||
| 3 | 4 |
| π | π | |||
cos(x − | ) = cos(π − | ) | ||
| 3 | 4 |
| π | 3π | |||
cos(x − | ) = cos | |||
| 3 | 4 |
| π | 3π | π | 3π | |||||
x − | = | + k*2π lub x − | = − | + k*2π, k∊C | ||||
| 3 | 4 | 3 | 4 |
| π | 3π | π | 3π | |||||
x = | + | + k*2π lub x = | − | + k*2π | ||||
| 3 | 4 | 3 | 4 |
| 13 | 5 | |||
x = | + k*2π lub x = − | π + k*2π | ||
| 12 | 12 |