B_t=A_t-\langle X,Y\rangle_t
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Recent Referers:
  1. http://formula.s21g.com/?B_t%3DA_t-%5Clangle%20X,Y%5Crang...
  2. http://formula.s21g.com/
  3. http://mkprob.hatenablog.com/?page=1340878551
  4. http://d.hatena.ne.jp/mkprob/201206