A vector vecA ur is rotated by a small a...

A vector `vecA` ur is rotated by a small angle `triangletheta` radian `(triangletheta ltl)` to get a new vector `barB` In that case `|vecB-vecA|` is:

`|vecA|triangletheta`

`|vecB|triangletheta-|vecA|`

`|vecA|(1-(triangletheta^(2))/(2))`

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