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Find the unit vector in the direction of vector a = i + j + 2k [Video]
![Find the unit vector in the direction of vector a = i + j + 2k [Video]](https://d77da31580fbc8944c00-52b01ccbcfe56047120eec75d9cb2cbd.ssl.cf6.rackcdn.com/a39612f6-203e-4c31-9c4d-b65131562dd9/slide11.jpg)