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Can this represent rotation? Why? 
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#1
May111, 11:44 PM

P: 76

If we say
r^{2}= (xa)^{2} + (yb)^{2} + (zc)^{2} can generally represent displacement, why can r^{2}= (x ia)^{2} + (y ib)^{2} + (z ic)^{2} generally represent rotation? (i^{2} = 1) And why r^{2}= x^{2 }+ y^{2} + (z  ia)^{2} represents rotation with respect to z axis 


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