In Boolean algbra `barA.barB` rquals

In the Boolean expression barA.barB is equal to

In the Boolean algebra, what is the equivalent expression for barA.barB ?

For any two vectors barA and barB if barA.barB=|bar AxxbarB| , the magnitude of barC=barA+barB is equal to :

For any two vectors barA and barB if barA.barB=|bar AxxbarB| , the magnitude of barC=barA+barB is equal to :

If bara.barb=barb.barc=barc.bara=0 then the value of [bara" "barb" "barc] is equal to

If bara.barb=barb.barc=barc.bara=0 and bara, barb, barc are non-zero, then the value of [bara" "barb" "barc] is equal to: a) 1 b) -1 c) 0 d) |bara||barb||barc|

If bara and barb are unit vectors such that bara + 2barb and 5bara- 4barb are perpendicular to each other, then the angle between bara and barb is