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In exercise 2 you used force measurements at various separations, which lines of code correctly setup symbolic expressions for our desired x and y in the variables expr_x and expr_y given
SM1=sp.Symbol('M1')
SM2=sp.Symbol(
'M2')
SR=sp.Symbol(
'R')
SF=sp.Symbol(
'F')
SUM1=sp.Symbol(
'uM1')
SUM2=sp.Symbol(
'uM2')
SUR=sp.Symbol(
'uR')
SUF=sp.Symbol(
'uF')