If bara,barb,barc are any three coplanar...

If `bara,barb,barc` are any three coplanar unit vectors then

straight line

plane

plane through the origin

sphere

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If bara,barb,barc are three non-coplanar vectors such that barr_1=bara-barb+barc,barr_2=barb+barc-bara,barr_3=barc+bara+barb, barr=2bara-3barb+4barc, if barr=lambda_1 barr_1+lambda_2 barr_2+lambda_3 barr_3 , then

If bara,barb,barc are three non-coplanar vectors and barp,barq,barr are defined by the relations barp=(barbxxbarc)/(bara barb barc),barq=(barcxxbara)/(bara barb barc),barr=(baraxxbarb)/(bara barb barc) then (bara+barb).barp+(barb+barc).barq+(barc+bara).barr=

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