Question

the direcrion cosines of a vector A are cos alpha= 1/5^½ cos beta = 1/2×5^½ and cos gamma = -2/5^½ then the vector A is
1. i+j-2k
2. 2î +j- 2k
3.2î +j- 4k
4.î +j- k​

Answer 1

Answer:

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