I'm not sure how to do part a) and b). For a) I don't get how the hint helps. Eg, I did and we know that a.b = 0 but there are no dot products in the former equation... Cheers!
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Originally Posted by usagi_killer I'm not sure how to do part a) and b). For a) I don't get how the hint helps. Eg, I did and we know that a.b = 0 but there are no dot products in the former equation... In fact, there is a (disguised) dot product in that equation, because is just another way of writing .
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