Root — roots of polynomials and transcendental functions

InverseFunction — symbolic functional inverse

DifferentialRoot, DifferenceRoot — linear differential, difference equation solutions

Trigonometric and Hyperbolic Functions

ArcSin  ▪  ArcCos  ▪  ArcTan  ▪  ArcSinh  ▪  ArcCosh  ▪  ArcTanh

Transcendental Solutions

ProductLog

Error Functions

InverseErf  ▪  InverseErfc

Gamma and Beta Functions

InverseGammaRegularized  ▪  InverseBetaRegularized

Elliptic Functions

InverseJacobiSN  ▪  InverseJacobiCN  ▪  InverseWeierstrassP  ▪  EllipticNomeQ  ▪  JacobiAmplitude

Bessel Function Zeros

BesselJZero  ▪  BesselYZero  ▪  AiryAiZero  ▪  AiryBiZero

Zeta Function Zeros

ZetaZero

FindRoot — invert functions numerically