Prove that .
Last edited by heathrowjohnny; February 9th 2008 at 07:03 PM.
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Originally Posted by heathrowjohnny Prove that . First read the start of this. Then substitute and into the formula. Then note that and are perpendicular and simplify accordingly.
Originally Posted by heathrowjohnny Prove that . i assume that they are vectors, butwhat are the elements? (i forgot them already) EDIT: mr f answered it already..
I actually think this is one of those cases where you are using a later result to prove an earlier one. All you have to do, I think, is use the determinant formula.
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