Browse by Stream
QnA
Home
QnA
Go To Your Study Dashboard

Get Answers to all your Questions

header-bg qa
  • Home
  • School
  • Need solution for RD Sharma Maths Class 12 Chapter 26 Directions Cosines and Direction Ratios Exercise Very Short Answer Question, question 9.

Need solution for RD Sharma Maths Class 12 Chapter 26 Directions Cosines and Direction Ratios Exercise Very Short Answer Question, question 9.

Answers (1)

Answer:

-1

Hint:

\cos ^2\alpha +\cos ^2\beta +\cos^ 2\gamma=1

Given:

The line makes angle \alpha ,\beta ,\gamma with co-ordinate axis.

Solution:

\begin{aligned} &=\cos 2 \alpha+\cos 2 \beta+\cos 2 \gamma \\ &=2 \cos ^{2} \alpha-1+2 \cos ^{2} \beta-1+2 \cos ^{2} \gamma-1 \\ &=2\left(\cos ^{2} \alpha+\cos ^{2} \beta+\cos ^{2} \gamma\right) \\ &=2(1)-3 \\ &=-1 \end{aligned}

Posted by

infoexpert24

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 Exam Date 2027 Highlights: Class 10, 12 exam dates soon on cbse.gov.in; private candidate form
anam-khan

CBSE 10th, 12th board exam schedule 2027: Sample papers, passing marks
anam-khan

CBSE Class 10, 12 Board Exam 2027: Schedule soon; passing marks, paper pattern

Latest Question