a
\(\left. {\begin{array}{*{20}{c}}
{\mathop A\limits^ \to \,\, \times \,\mathop B\limits^ \to \,\, = \,\,0\,\, \Rightarrow \,\,\mathop A\limits^ \to \,\,||\,\,\mathop B\limits^ \to } \\
{\mathop B\limits^ \to \,\, \times \,\mathop C\limits^ \to \,\, = \,\,0\,\, \Rightarrow \,\,\mathop B\limits^ \to \,.||\,\,\mathop C\limits^ \to \;\,}
\end{array}} \right\}\,\, \Rightarrow \,\,\mathop A\limits^ \to \,\,||\,\,\mathop C\limits^ \to \)
દા.ત \(\mathop A\limits^ \to \) અને \(\mathop C\limits^ \to \) વચ્ચેનો કોણ શૂન્ય છે.