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How will i find Rab dot Rac from three points, for example the given are A(2,5,-1),B(3,-2,4) and C(-2,3,1)?

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please explain how it is done thanks ^^

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  1. Do B minus A.  This gives you Rab

    Do C minus A.  This gives you Rac.

    Now multiply the x component from Rab with x component of Rac, y with y, and z with z.  Then add them up.  You should end up with a single number (a scalar).

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