If denote the directions of cosines of three mutually perpendicular vectors i Question If denote the directions of cosines of three mutually perpendicular vectors in the space , prove that \sf{AA^T \: = \: I}, Where, in progress 0 Math Maria 3 weeks 2021-08-23T06:46:09+00:00 2021-08-23T06:46:09+00:00 1 Answer 0 views 0

## Answers ( )

Given :

(i=1,2,3) denote the direction cosines of three mutually perpendicular vectors in space.

Then,

Then,

## Hence proved.