Browse by Stream
QnA
Home
QnA
Go To Your Study Dashboard

Get Answers to all your Questions

header-bg qa
  • Home
  • School
  • Explain solution RD Sharma class 12 Chapter 27 Striaght Line in Space Exercise Fill in the blanks question 4

Explain solution RD Sharma class 12 Chapter 27 Striaght Line in Space Exercise Fill in the blanks question 4

Answers (1)

best_answer

Answer :    \pm \frac{1}{\sqrt{3}}

Hint :    l^{2}+m^{2}+n^{2}=1   

Given  :   l,l,l   are direction cosine of a line ,

Solution  : Since , direction cosine  of a line are  l,l\; \text{and} \: l

                  \therefore l=l, \mathrm{~m}=l \text { and } \mathrm{n}=l

                     We know that  , l^{2}+m^{2}+n^{2}=1

                   \begin{aligned} &=>l^{2}+l^{2}+l^{2}=1 \\ & \end{aligned}

                   \Rightarrow>l^{2}=\frac{1}{3} \\

                 \therefore l=\pm \frac{1}{\sqrt{3}}

Posted by

infoexpert27

View full answer

Crack CUET with india's "Best Teachers"

  • HD Video Lectures
  • Unlimited Mock Tests
  • Faculty Support
cuet_ads

Similar Questions

Trending Articles/News

anam-khan

CBSE Class 10, 12 board exams 2025 from April 7 to 11 for sports students
anam-khan

CBSE Class 12 history paper 2025 moderately difficult, tested students’ understanding
anam-khan

CBSE Class 12 Computer Science Exam Analysis 2025: Paper 'moderate', but 'tougher' than last three years

Latest Question