In part B, you work with the axes

Using Python and "Y" as the symbol for , "l" (a lowercase L) as the symbol for and "D" as the symbol for , and placing a u in front of each of these for the uncertainty in these variables (e.g. uY, ul and uD), work out a symbolic expression for the uncertainty in , Then print the symbolic expression and copy and paste the output of this print call directly into the input cell below without any changes. 

E.g. if your expression is called expr_u_y, add the line

print(expr_u_y)

to your code and copy from the terminal or console the output that this line generates and paste this into the text cell. 

IMPORTANT NOTE: Make sure to use the method in Python and Uncertainties and to print the result of that, part of the assessment for labs is specifically learning python, so it is important to practice the coding, and this question can only be answered correctly if you use the python method in the Python and Uncertainties activity.