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  • Need solution for RD Sharma Maths Class 12 Chapter 26 Directions Cosines and Direction Ratios Exercise Very Short Answer Question, question 1.

Need solution for RD Sharma Maths Class 12 Chapter 26 Directions Cosines and Direction Ratios Exercise Very Short Answer Question, question 1.

Answers (1)

Answer:

We need to define it.

Hint:

Cosines are trigonometric functions.

Given:

Direction cosines of a directed line.

Solution:

The directed cosine of a directed line are the cosines of the angles which the lines makes with the positive direction of the co-ordinate axis.

\begin{aligned} &l=\frac{a}{\sqrt{a^{2}+b^{2}+c^{2}}} \\ &m=\frac{b}{\sqrt{a^{2}+b^{2}+c^{2}}} \\ &n=\frac{c}{\sqrt{a^{2}+b^{2}+c^{2}}} \end{aligned}

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