Hello, I am clearly making a stupid mistake, but what?
Arc length calculation:
x = Symbol('x')
formula = 2 * x**2
d = diff(formula, x)
i = integrate(sqrt(1 + d**2), (x, 5.0, 10.0))
gives a result of 150.087
but changing the formula to this:
formula = 0.26666 * x**2
gives a result of zero. In fact any coefficient less than one gives a
result of zero.
Thanks, Andy
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