More detailed error propagation formulas for Assignment 4

[M1ssing-N0]

I think formulas in section Error propagation (analytical) were a bit unclear.
For example, the uncertainty formula for multiplication was meant for two independent variables, and thus is not suitable for verifying assignment 1, with an $r^2$ in the denominator.
My suggestion is to specify that the formulas are for independent variables, or use this formula https://wikimedia.org/api/rest_v1/media/math/render/svg/7a7686692e58c0857185c50e2146a153449bade3. It requires to take partial derivative of each variable involved, avoiding the issue above.