# Answer to Question #1211 in Linear Algebra for huihui

Question #1211

**u**and

**v**are two non null vectors in

**R**,&

_{n}||u|| and ||v|| denote their respective lengths, and.&

||u – v|| denotes difference between u and v.

If ||u||=1 and ||v||=1 and ||u – v|| = ,& & then the u and v are&

& i. orthogonal&

& ii. Linearly independent&

& iii. Both i. and ii.&

& iv. All of them

Expert's answer

As the length of the vector||u-v|| = sqrt (||u||2 + ||v||2 - 2 ||u|| ||v|| cos (180-α) ) = sqrt( 1 + 1 +2 cos (α) ) = √ 2;

2 = 2 + 2 cos(α);

cos(α) = 0;

α = 90;

The vectors are orthogonal and then linear independent.

2 = 2 + 2 cos(α);

cos(α) = 0;

α = 90;

The vectors are orthogonal and then linear independent.

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