| nπ | (n+1)π | (n+1)π | ||||
2sin | *sin | + sin | = | |||
| 6 | 6 | 3 |
| nπ | (n+1)π | (n+1)π | (n+1)π | |||||
= 2sin | *sin | + 2sin | *cos | |||||
| 6 | 6 | 6 | 6 |
| x | ||
masz (upraszczając) sin | i przekształcasz: | |
| 3 |
| 2x | x | x | x | |||||
= sin | = sin(2* | ) = 2sin | cos | (ze wzoru na sin2x) | ||||
| 6 | 6 | 6 | 6 |
| (n+1)π | π | n+1 | ||||
cos | = sin( | + | π) | |||
| 6 | 2 | 6 |
| π | ||
sin( | +x) = cosx | |
| 2 |