Question 4 (Or 2nd) - CBSE Class 12 Sample Paper for 2019 Boards - Solutions of Sample Papers and Past Year Papers - for Class 12 Boards

Last updated at Oct. 1, 2019 by Teachoo

Question 4 (OR 2 nd question)

Find the direction cosines of the line:

(x - 1)/2 = –y = (z + 1)/2

Find the direction cosines of line: (x – 1)/2 = – y = (z + 1)/2

Question 4 (Or 2nd) - CBSE Class 12 Sample Paper for 2019 Boards - Part 2

Transcript

Question 4 (OR 2nd question) Find the direction cosines of the line: (𝑥 − 1)/2 = –y = (𝑧 + 1)/2 Given line (𝑥 − 1)/2 = –y = (𝑧 + 1)/2 (𝑥 − 1)/2 = (−𝑦)/1 = (𝑧 + 1)/2 (𝑥 − 1)/2 = 𝑦/(−1) = (𝑧 + 1)/2 So, direction ratios are 2, –1, 2 ∴ a = 2, b = –1, c = 2 Direction cosines = 2/√(2^2 + (−1)^2 + 2^2 ) ,(−1)/√(2^2 + (−1)^2 + 2^2 ) ,2/√(2^2 + (−1)^2 + 2^2 ) = 2/√(4 + 1 + 4) ,(−1)/√(4 + 1 + 4) ,2/√(4 + 1 + 4) = 2/√9 ,(−1)/√9 ,2/√9 = 𝟐/𝟑 ,(−𝟏)/𝟑 ,𝟐/𝟑

CBSE Class 12 Sample Paper for 2019 Boards

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Class 12

Solutions of Sample Papers and Past Year Papers - for Class 12 Boards

CBSE Class 12 Sample Paper for 2022 Boards (MCQ Based - for Term 1)
CBSE Class 12 Sample Paper for 2021 Boards
CBSE Class 12 Sample Paper for 2020 Boards
CBSE Class 12 Sample Paper for 2019 Boards
CBSE Class 12 Sample Paper for 2018 Boards

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Davneet Singh

Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 10 years. He provides courses for Maths and Science at Teachoo.