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  3. please prove this proposition its about interpolation at chebyshev extremozer...

Question: please prove this proposition its about interpolation at chebyshev extremozer...

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= cos(rk/n))2-o are the ertremtzers of T,,(z) on )-пп-0(z-yj) and Un-1(z)-пі.tz-w) If {yk Proposition [- 9.4.7. 1,1, then the polynomials v(z satisfy the foltowing:

(ii)肛. oces(t), then Un(エ)-201ī sin(nt) n2-1 sin()

Please prove this proposition (it's about interpolation at Chebyshev Extremozer)

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