| 1 |
| ||||||||||||
cosα + cos2α + ... + cosnα = | ( | − 1) | |||||||||||
| 2 |
|
| sin1,5a −sin0,5a | 2cosa*sin0,5a | |||
dla n=1 L=cosa P= | = | =cosa | ||
| 2sin0,5a | 2si0,5a |
| sin(k+0,5)a−sin0,5a | ||
cosa+cos2a+...+coska= | ||
| 2sin0,5a |
| sin(k+1,5)a−sin0,5a | ||
cosa+cos2a+ .. +coska+cos(k+1)a= | ||
| 2sin0,5a |
| sin(k+0,5)a−sin0,5 | ||
L= | +cos(k+1)a = | |
| 2sin0,5 |
| sin(k+0,5)a−sin0,5+2sin0,5*cos(k+1)a | ||
= | = | |
| 2sin0,5a |
| sin(k+0,5)a−sin0,5a +sin(k+1,5)a−sin(k+0,5)a | ||
= | = | |
| 2sin0,5a |
| sin(k+1,5)a−sin0,5a | ||
= | =P | |
| 2sin0,5a |
