Question: Let a = a 1 i + a 2 j + a 3 k be a constant vector and r = xi + yj +

Let
a = a1i + a2j + a3k
be a constant vector and
r = xi + yj + zk.
Verify the given identity.
(a r)=0
(a r)=
x
y
z
a1 a2 a3
x y z
=
x
y
+
z
=0

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