Show latex formula of calclation

## Project description

  .oooooo.             oooo            ooooooooooooo           ooooooo  ooooo
d8P'  Y8b            888            8'   888   8            8888    d8'
888           .oooo.    888   .ooooo.       888       .ooooo.     Y888..8P
888          P  )88b   888  d88' "Y8      888      d88' 88b     8888'
888           .oP"888   888  888            888      888ooo888    .8PY888.
88b    ooo  d8(  888   888  888   .o8      888      888    .o   d8'  888b
Y8bood8P'  Y888""8o o888o Y8bod8P'     o888o     Y8bod8P' o888o  o88888o


# CalcTeX

## Value

from calctex.unit import N, m, Pa
f = 40 & N | 3    # 力   4.00 N     有効数字3桁
s = 2 & m**2 | 4  # 面積 2.000 m^2  有効数字4桁

p = f / s         # 圧力

print(p.tex())
# 2.00 \times 10\,\mathrm{kg \cdot m^{-1} \cdot s^{-2}}
print(p.expect(Pa).tex())
# 2.00 \times 10\,\mathrm{Pa}


## Unit

from calctex.unit import *

print(N == kg*m*s**-2)
# True
print(Pa == N/m**2)
# True


## roundtex

from calctex.common import roundtex

print(roundtex(100, significant=2))
# 1.0 \times 10^{2}