- #1
influx
- 164
- 2
Homework Statement
http://photouploads.com/images/8ba21e.png
{moderator's not: Inserted image so it's visible without having to follow a link}
2. Homework Equations
a·(b x c) = b·(c x a)
The Attempt at a Solution
How did they get from the (b) to (c)? In particular, I am referring to the numerator and denominator of the fraction. I mean if you apply a·(b x c) = b·(c x a) then surely the terms inside the brackets (of both numerator and denominator) of part (c) should be the other way round?
I mean for instance rCD·(k x rBA) = k·(rBA x rCD) and not rCD·(k x rBA) = k·(rCD x rBA) as they got?
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