WAlaguerre WAlegendre WChebt WChebtd WChebu WGegenbauer WGegenbauerd WGegenbauerd1 WHermite WJacobi WJacobid WJacobid1 WJacobid2 WLaguerre WLegendre WLegendred WSharmonic WSharmonici WSharmonicr

WChebt() Function WChebt ( N As  Long, X As  Double  ) Chebyshev polynomial of first kind Tn(x) Purpose This function computes the Chebyshev polynomial of the first kind Tn(x). Tn(x) = cos(nt), where x = cos(t) This polynomial follows the recurrence formula: Tn+1(x) = 2xTn(x) - Tn-1(x), where T0(x) = 1 and T1(x) = x (n > 0) Returns Chebyshev polynomial of first kind Tn(x). Parameters [in] N Argument n. (N >= 0) [in] X Argument x. Reference boost/math/special_functions