Hi.
Can anyone explin why the following is producing an error please. First integral works, the second fails.
g(x) = 2*x
print numerical_integral(g, 1, 2)
(3.0, 3.3306690738754696e-14)
h(x) = x
print numerical_integral(h, 1, 2)
Traceback (most recent call last):
ValueError: free variable: x |--> x
