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Math Help - covariance expansion

  1. #1
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    covariance expansion

    covariance expansion-screen-shot-2012-12-12-7.43.56-pm.png

    what does the ....+.... mean at the end? After finding the covariance for each term in the first part by each term in the second what is the next step?
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  2. #2
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    Re: covariance expansion

    They are just carrying the plus-minus throughout the rest of the derivation. In short they are being lazy.
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  3. #3
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    Re: covariance expansion

    thanks!

    but what is the rest of the derivation?
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