## Proof Of Formula Using Vector Triple Product Formula

Theorem

(1)

Proof

The vector triple product formula is (2)

In equation (1) writethen use (2) to give

Now use vec c = vec a times vec b to give

vec a cdot (vec a times vec b )=0 so

Now useto give

Theorem

(1)

Proof

The vector triple product formula is (2)

In equation (1) writethen use (2) to give

Now use vec c = vec a times vec b to give

vec a cdot (vec a times vec b )=0 so

Now useto give