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Homework Statement
It is known that ##M_1,M_2, M_3## commute with each other but I don't see how the second line is achieved even though it says that it's using that ##M_1## and ##M_2## commute?
Note M_{2}(1+M_{1}) = M_{2} + M_{2}M_{1}
How can you rewrite the right hand side using the fact that M_{1} and M_{2} commute?
OK. Can you see something you can do with this expression that will help?##M_2 + M_1M_2##
##(1 +M_1)M_2## ?OK. Can you see something you can do with this expression that will help?