If a,b,c are three vectorssuch that IaI=1, IbI=2, IcI=3 and a.b=b.c=c.a=0, then I[abc]I=?
If a,b,c are three vectorssuch that IaI=1, IbI=2, IcI=3 and a.b=b.c=c.a=0, then I[abc]I=?

In viewing through a magnifying glass, one usually positions one's eyes very close to the lens. Does angular magnification change if the eye is moved back?
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