- #1
Nobody1111
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Proof, that determinant (with n rows and columns)
| cosx 1 0 0 ... 0 0 |
| 1 2cosx 1 0 ... 0 0 |
| 0 1 2cosx 1 ... 0 0 |
| 0 0 1 2cosx ... 0 0 | = cos nx
|...... |
| 0 0 0 0 ... 2cosx 1 |
| 0 0 0 0 ... 1 2cosx |
The main proble for me is to evaluate this determinant.
Do you have any ideas?
Thanks for help.
| cosx 1 0 0 ... 0 0 |
| 1 2cosx 1 0 ... 0 0 |
| 0 1 2cosx 1 ... 0 0 |
| 0 0 1 2cosx ... 0 0 | = cos nx
|...... |
| 0 0 0 0 ... 2cosx 1 |
| 0 0 0 0 ... 1 2cosx |
The main proble for me is to evaluate this determinant.
Do you have any ideas?
Thanks for help.