How to prove that ?

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Let Then Add the equalities:

Thanks but, I don't see how did you get ? I can't follow that equality, I was trying to figure out by myself but I couldn't.

Originally Posted by Soldado Thanks but, I don't see how did you get ? I can't follow that equality, I was trying to figure out by myself but I couldn't. lats expand S1 S2 in the same way this is the the expand of

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