## Practice Final #4 |
npattison |
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So when finding the angle between the two vectors in the first part, do we take the absolute value of v dot w on the top? |

JeffreyLam1: June 4, 2015, 11:08 p.m. |
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yes, since the absolute value of the dot product of two vectors is equal to their individual magnitudes times the angle between them. |

Jerry_Zhongyang_Liu: June 5, 2015, 8:48 p.m. |
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If you limit the range of the angle to [0, pi/2], then you should add an absolute value to the dot product. The problem didn't ask you to do so, so you should not put an absolute value on it. |