There are 6 vectors: a, b, c, d, e, f. Simply the following expression: [ a(b . c) X (e . f)d ] X [ a – d ].‘X’ represents cross product while ’.‘ represents dot product. Vectors a & d are perpendicular. a) 0 b) (b . c)(e . f) [ d + a ] c) (b . c)(e . f) [ d – a ] d) (b . c)(e . f) [ d X a ]

There are 6 vectors: a, b, c, d, e, f. Simply the following expression: [ a(b . c) X (e . f)d ] X [ a – d ].‘X’ represents cross product while ’.‘ represents dot product. Vectors a & d are perpendicular. a) 0 b) (b . c)(e . f) [ d + a ] c) (b . c)(e . f) [ d – a ] d) (b . c)(e . f) [ d X a ]