Prove that 
, if and only if 
are perpendicular, given 
.
given: (
To prove: vectors 
are mutually perpendicular to each other.
Hence, 
are mutually perpendicular to each other.as 
is given.
15
Prove that , if and only if are perpendicular, given .
given: (
To prove: vectors are mutually perpendicular to each other.
Hence, are mutually perpendicular to each other.as is given.