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Prove that (vecaxxhati)^2+(vecaxxhatj)^2...

Prove that `(vecaxxhati)^2+(vecaxxhatj)^2+(vecaxxhatk)^2=2veca^2`

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  3. Prove that (vecaxxhati)^2+(vecaxxhatj)^2+(vecaxxhatk)^2=2veca^2

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