`veca + ((VECQ - veca .VECN))/(|vecn|)``veca + 2 (((vecq - veca.vecn))/(|vecn|^(2))) vecn` `veca + (2 (vecq + veca.vecn))/(|vecn|) vecn``veca- (2 ( vecq - veca.vecn))/(|vecn|)`
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