2 | 15 | |||
∑ n2*sin( | )tg( | ) | ||
n2 | n |
2 | π | |||
sinx≥ | x x∊<0, | ) | ||
π | 2 |
2 | 15 | 2 | 2 | 15 | ||||||
n2*sin( | )tg( | )≥ n2* | * | * | ||||||
n2 | n | π | n2 | n |
2 | 2 | 15 | 60 | |||||
n2* | * | * | = | <−−− szereg Dirichleta rozbieżny. | ||||
π | n2 | n | πn |
2 | 15 | |||
∑ n2*sin( | )tg( | ) jest rozbieżny. | ||
n2 | n |
n2sin(2/n2)tg(15/n) | |
→skończona liczba>0 | |
1/n |