List the Chebyshev polynomials Tn(x) for n = 0,1,2,3,4,5,6.
> expand(cos(0*x));expand(cos(1*x));expand(cos(2*x));expand(cos(3*x));expand(cos(4*x));expand(cos(5*x));expand(cos(6*x));
第n 項 等於 2 倍 第n-1 項 乘 cos(x) 減 第 n-2 項
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