| n2 | 2πn | |||
cn= | cos | |||
| 1+n2 | 3 |
| nπ | ||
dn = (1+ 1n)n (−1)n + sin | ||
| 4 |
| 1 | 2πn | |||
− | ≤cos( | )≤1 | ||
| 2 | 3 |
| n2 | ||
c3k= | ||
| 1+n2 |
| n2 | ||
c3k+1=− | ||
| 2(1+n2) |
| n2 | ||
c3k+2=− | ||
| 2(1+n2) |
| n2 | ||
lim c3k= | = 1 | |
| 1+n2 |
| 1 | ||
lim c3k+1= lim c3k+2 = − | ||
| 2 |
| 5^2 | 52 |
| 2^{10} | 210 |
| a_2 | a2 |
| a_{25} | a25 |
| p{2} | √2 |
| p{81} | √81 |
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