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The Chebyshev polynomials Tn(x) of degree n are special orthogonal polynomial functions defined on the domain [-1, 1].
Orthogonality:
| -1∫1 W(x) Ti(x) Tj(x) dx = δij |
| W(x) = (1 – x2)–1/2 (-1 < x < 1) |
They obey certain recurrence relations:
| Tn(x) = 2 x Tn-1(x) – Tn-2(x) |
| T0(x) = 1 |
| T1(x) = x |
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