I learned about cross product earlier and despite struggling to get my head around it when Ant explained it, I found out its really quite easy in practise. Above is my scrabbled mess of a working-out sheet, hopefully its understandable to everyone.
Here's how I work it out:
Since there are 3 values, (x,y,z) you can single out one of them and use the other two. So to work out 'x' I can use 'y' and 'z'. The diagram above shows it the best, well better than I can explain it in words anyway.
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