require 'mathmas'
true
include Mathmas
Object
expr = 1/x
expr.exec(x: 3)
(1/3)
expr.exec(x: 1)
1
f(x) <= 1/x
f
f(3)
f.plot(x: 1..3)
["x"]
g(x, y) <= (x + y)/(x**3 + y**2)