https://functions.wolfram.com/HypergeometricFunctions/ChebyshevTGeneral/03/ShowAll.html
Chebyshev function of the first kind: Specific values
Specific values (18 formulas)
chebyshev functionof thefirstkindspecific
https://functions.wolfram.com/HypergeometricFunctions/ChebyshevTGeneral/06/01/03/01/0002/
Chebyshev function of the first kind: Series representations (formula 07.04.06.0040)
Series representations
chebyshev functionof thefirstkindseries
https://functions.wolfram.com/HypergeometricFunctions/ChebyshevUGeneral/06/01/08/01/01/0005/
Chebyshev function of the second kind: Series representations (formula 07.05.06.0074)
Series representations
chebyshev functionof thesecondkindseries