Question

38. Show that AXA = 0 and A. Ả=A^2
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Answer 1

Step-by-step explanation:

For vectors, a2 is defined to equal a⋅a so there is nothing to prove (I think you must mean how to prove that a⋅a=||a||2 , which is also true only if the right hand side is defined that way, i.e., to be equal to the left hand side, b/c there are other ways to define it). As for the cross product, simply write it out according to the definition in terms of the components of a and it "falls right out.”