Precision with Decimal Type

[charlesrkiss]

I'm having some problems with getting the desired precision, and something like this also happens.

>>> G=Decimal(0.999999999999999999999900000000000000)
>>> print(G)
1

What am I doing wrong?

See the text and image below for extra stuff, when I was working with theta. Theta was generated in the same python script and session:

import math
import decimal
from decimal import getcontext

getcontext().prec = 36

theta = decimal.Decimal(1/2 * math.asin(2 * (F/N)))

theta: 1.00000000000000010105568267120302867849435113356548754381947219371795654296875E-11

C = decimal.Decimal(math.cos(theta))

C: 1


Thank you for reading this!