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  • Please Solve R.D.Sharma class 12 Chapter 22 Algbra of Vectors Exercise 22.9 Question 2 Maths Textbook Solution.

Please Solve R.D.Sharma class 12 Chapter 22 Algbra of Vectors Exercise 22.9 Question 2 Maths Textbook Solution.

Answers (1)

Answer: 1, 1, 1 cannot be the direction cosines of a straight line.

Given: Prove that 1, 1, 1 cannot be the direction cosines of a straight line.

Hint: Check by using l^{2}+m^{2}+n^{2}=1

Explanation: We know if l, m, n are the direction cosines of any line then l^{2}+m^{2}+n^{2}=1

But here 1^{2}+1^{2}+1^{2}=3\neq 1

So 1, 1, 1 can’t be the direction cosines for any line.

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