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Let A ? be a unit vector along the axis of rotation of a purely rotating body and B ? be a unit vector along the velocity of a particle P of the body away from the axis. The value of A ? .B ? is

Let A
?
be a unit vector along the axis of rotation of a purely rotating body and B
?
be a unit vector along
the velocity of a particle P of the body away from the axis. The value of A
?
.B
?
is

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