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17 Oct 2009 11:50:49 IST

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a*b=b*a what is the angle between these vectors?

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a*b=b*a what is the angle between these vectors?

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ari

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Joined: 10 Aug 2009

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17 Oct 2009 11:55:33 IST

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a*b=b*a what is the angle between these vectors?

djdylan2000. bits goa eee

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17 Oct 2009 12:30:00 IST

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if u mean AxB=BxA then angle betw them is zero because AxB= - BxA by def and both can hold true only if cross product is 0. ie AB Sint =0. (assuming A≠0 and B≠0)

Bipin Dubey

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Joined: 23 Jan 2007

Posts: 7942

17 Oct 2009 15:58:54 IST

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if it is dot product then a.b = b.a is always true for any two vectors a,b

If it is cross product : a x b = -(b x a) = b x a (given)

=> a x b = 0 i.e. a and b are parallel

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