0 votes 0 votes The value of c which makes the angle 45° between a = i + cj and b = i+ j is a) 1 b) 1/ √ 2 c) -1/ √ 2 d) 0 Linear Algebra isro-ece engineering-mathematics + – sh!va asked Mar 1, 2017 retagged Mar 9, 2019 by Naveen Kumar 3 sh!va 419 views answer comment Share Follow See all 0 reply Please log in or register to add a comment.
1 votes 1 votes dot product a.b =|a||b| cos45 => 1+c= sqrt(1+c2 )sqrt(2) /sqrt(2) =>(1+c)2 =1+c2 => 2c=0 , c=0 so ans is D Sanjay Sharma answered Mar 2, 2017 Sanjay Sharma comment Share Follow See all 0 reply Please log in or register to add a comment.