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-2k2. 2î +j- 2k3.2î +j- 4k 4.î +j- k

The direcrion cosines of a vector A are cos alpha= 1/5^½ cos beta = 1

1.	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-2k2. 2î +j- 2k3.2î +j- 4k 4.î +j- k
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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-2k2. 2î +j- 2k3.2î +j- 4k 4.î +j- k​

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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-2k2. 2î +j- 2k3.2î +j- 4k 4.î +j- k