cmath.cos(x) Return the cosine of x.

logb(x) Returns the exponent of the magnitude of the operand’s MSD.

fma(x, y, z) Returns x multiplied by y, plus z.

is_zero(x) Returns True if x is a zero; otherwise returns False.

min(other, context=None) Like min(self, other) except that the context rounding rule is applied before returning

copy_decimal(num) Return a copy of the Decimal instance num.

is_canonical(x) Returns True if x is canonical; otherwise returns False.

math.acosh(x) Return the inverse hyperbolic cosine of x.

from_float(f) Classmethod that converts a float to a decimal number, exactly. Note Decimal

quantize(x, y) Returns a value equal to x (rounded), having the exponent of y.