Mark (√) against the correct answer in the following:
If and are mutually perpendicular unit vectors then
Given are mutually perpendicular unit vectors
⇒|
And angle between the vectors is and =0
Asking to find (3
Multiplying ,
=(35)- (36) ( + (25)(- (26)
= 15( [reason: dot product is commutative i.e,
=15-8(-12
=15-12 [reason:=0]
= 3