NCERT Example 9 - Vector Algebra

Question: Write the direction ratios of a = i-hat + j-hat - 2 k-hat and hence calculate its direction cosines.

Answer: Direction ratios 1, 1, -2; direction cosines 1/sqrt(6), 1/sqrt(6), -2/sqrt(6).

Full step-by-step NCERT solution with diagrams on Something by Zero.

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