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If A = 4u i - usj + uk and B = 2i - uk are vector functions of scalar variable u, then the derivative

If A = 4u i - usj + uk and B = 2i - uk are vector functions of scalar variable u, then the derivative of A x B is: Select one: O a . 4u i+ (12u2 + 2)j+ 6u2k O b. 13i+ 12u2j O C. 3uzi+ 2uk O d. 14u - 3u2

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