- #1
Saladsamurai
- 3,020
- 7
Homework Statement
Using the definition [itex]\bold{A}\times \bold{B}=AB\sin\theta[/itex] show whether or not [itex](\bold
A\times\bold B)\times\bold C=\bold A\times(\bold B\times\bold C)[/itex]
I know this is probably easy, but I am missing the obvious here. So I started like this:
Assuming [itex]\theta[/itex] lies between A and B and [itex]\phi[/itex] lies between [itex]\bold{A}\times \bold{B}[/itex] and C then [itex](\bold
A\times\bold B)\times\bold C=(AB\sin\theta)C\sin\phi[/itex] ... wait is that it?
Since that mess is associative then so is the cross-product?
Granted, I should probably include an angle between B and C to be thorough...