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1. |
If \(\vec a, \vec b, \vec c\) are vectors such that \(\vec a + \vec b + \vec c = 0\) and \(|\vec a| = 10, |\vec b| = 4, |\vec c| = 6\), then the angle between the vectors \(\vec b\) and \(\vec c\) is? |
A. | 0° |
B. | 30° |
C. | 45° |
D. | 90° |
Answer» B. 30° | |