Last updated at April 21, 2021 by Teachoo

Transcript

Ex 10.2, 12 Find the direction cosines of the vector ๐ ฬ + 2๐ ฬ + 3๐ ฬ . Let ๐ โ = ๐ ฬ + 2๐ ฬ + 3๐ ฬ = 1๐ ฬ + 2๐ ฬ + 3๐ ฬ Direction ratios are a = 1, b = 2, c = 3 Magnitude of ๐ โ = โ(12+2^2+3^2 ) |๐ โ | = โ(1+4+9) = โ14 Direction cosines are (๐/|๐ โ | ,๐/|๐ โ | ,๐/|๐ โ | ) Direction cosines of ๐ โ = (๐/โ๐๐,๐/โ๐๐,๐/โ๐๐)

Ex 10.2

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Ex 10.2, 12 You are here

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Ex 10.2, 18 (MCQ) Important

Ex 10.2, 19 (MCQ) Important

About the Author

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.