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Math Help - [SOLVED] Proof Involving identities or properties

  1. #1
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    [SOLVED] Proof Involving identities or properties

    I know what I should get but I am having trouble seeing how del.((A.R)*R)=4A.R or how del.((R.R)*A)=2A.R. I am assuming it is something to due with a product rule that I am missing.
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  2. #2
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    Nevermind Figured it out
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