Dear Student, If A, B and C are mutually perpendicular then, A x B will be the vector perpendicular to both A and B i.e. C only. Now C x C = 0 because the cross product of two same vectors is zero. Thanks.
If A, B and C are mutually perpendicular then, A x B will be the vector perpendicular to both A and B i.e. C only. Now C x C = 0 because the cross product of two same vectors is zero. Thanks.