ExpToTrig[expr] converts exponentials in expr to trigonometric functions.
FiniteGroupCount[n] gives the number of finite groups of order n.
Gudermannian[z] gives the Gudermannian function gd(z).
Haversine[z] gives the haversine function hav(z).
Hyperfactorial[n] gives the hyperfactorial function H(n).
Hypergeometric0F1Regularized[a, z] is the regularized confluent hypergeometric function \[Null]_0 F_1 (a; z)/\[CapitalGamma](a).
Hypergeometric1F1Regularized[a, b, z] is the regularized confluent hypergeometric function \[Null]_1 F_1 (a; b; z)/\[CapitalGamma](b).
KroneckerSymbol[n, m] gives the Kronecker symbol (n/m).
Log10
(Built-in Mathematica Symbol) Log10[x] gives the base-10 logarithm of x.
MathieuCharacteristicA[r, q] gives the characteristic value a_r for even Mathieu functions with characteristic exponent r and parameter q.