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Let `bar a=thati-3hatj+2thatk , bar b=hati-2hatj+2hatk and bar c=3hati+thatj-hatk,` then the value of the integral`int_1^2(bar a.(bar bxxbarc))` dt equals-
A. |
0 |
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B. |
6 |
C. |
-2 |
D. |
4 |