જો $\vec a \,\, = \,\,i\,\, + \;\,3j\,\, - \,\,2k$ અને $\vec b \,\, = \,\,4i\,\, - \,\,2j\,\, + \;\,4k$ તો $\left( {2\vec a \,\, + \;\,\vec b } \right)\,\,.\,\,\left( {\vec a \,\, - \,\,2\vec b } \right)\,\, = \,\,..........$
→કોઈ પણ ત્રણ સદીશો $\vec a ,\,\vec b ,\,\vec c $ માટે $\vec a \times \left( {\vec b \,\, + \,\vec c } \right)\,\, + \;\vec b \,\, \times \,\,\left( {\vec c \, \times \,\,\vec a \,} \right)\,\, + \;\,\vec c\,\, \times \,\,\left( {\vec a + \,\,\vec b } \right)\,$ $ = \,\,......$
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