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