Question

Find the angles between the vectors in Exercises 9–12 to the nearest hundredth of a radian.

9. u = 2i + j, v = i + 2j - k

10. u = 2i - 2j + k, v = 3i + 4k

11. u = sqrt(3)i - 7j, v = sqrt(3)i + j - 2k

12. u = i + sqrt(2)j - sqrt(2)k, v =-i + j + k

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