Calculus: Early Transcendentals 8th Edition

To multiply two vectors we use the cross product equation as follows: $|a^ \to \times b^ \to|=|a^ \to||b^ \to|sin \theta$ Only if $\theta =90, 270, 450 ...$ does $|a^ \to \times b^ \to|=|a^ \to||b^ \to|$ Hence, the given statement is false.