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[" (d) "a times b,b times c,c times a" are multitiny perpenditular "],[" 3.The edges of a parallelopiped are of unit length and are "],[" parallel to non-coplanar unit vectors "vec a,dot b,vec c" such that "],[dot a*dot b=dot b*dot c=dot c*dot a=(1)/(2)*" Then,the volume of the parallelopiped "],[" is "],[[" (a) "(1)/(sqrt(2))," (b) "(1)/(2sqrt(2))," (c) "(sqrt(3))/(2)," (d) "(1)/(sqrt(3))]]

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