The Student Room Group

Lagrange Identity

Need to prove

(axb).(cxd)=(a.c)(b.c)-(a.d)(b.c)
where a,b,c,d are vectors
So

=> (axb).(cxd)=d.[(axb)xc]

How?


Thanks
Have you tried using suffix notation?
Reply 2
Original post by Daniel Freedman
Have you tried using suffix notation?


we havent been taught that /dont require it, the notes I have just follow this line of reasoning
Reply 3
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