## Calculus 8th Edition

To multiply two vectors we use cross product equation a s follows: $|a^ \to \times b^ \to|=|a^ \to||b^ \to|sin \theta$ If $\theta =90$ and $sin \theta =0$ then $|a^ \to \times b^ \to|=|a^ \to||b^ \to|$ Hence, the given statement is false.