acos(X) -> float()

acosh(X) -> float()

asin(X) -> float()

asinh(X) -> float()

atan(X) -> float()

atan2(Y, X) -> float()

atanh(X) -> float()

ceil(X) -> float()

OTP 20.0

cos(X) -> float()

cosh(X) -> float()

exp(X) -> float()

floor(X) -> float()

OTP 20.0

fmod(X, Y) -> float()

OTP 20.0

log(X) -> float()

log10(X) -> float()

log2(X) -> float()

OTP 18.0

pow(X, Y) -> float()

sin(X) -> float()

sinh(X) -> float()

sqrt(X) -> float()

tan(X) -> float()

tanh(X) -> float()

erf(X) -> float()

erf(X) = 2/sqrt(pi)*integral from 0 to X of exp(-t*t) dt.

erfc(X) -> float()

pi() -> float()