ChebyshevT
 Usage
• ChebyshevT[n, x] 给出了第一型的Chebyshev多项式.
Notes
• 对整数 n给出了明确的多项式. •  . • ChebyshevT[n, z]在复 z 平面上，从  到  有一条不连续分支线. • 参见Mathematica全书: 节 3.2.9.
 Further Examples
Here is the fifth Chebyshev polynomial.
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This is the derivative.
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This is the indefinite integral.
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This verifies the defining equation.
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