If $\overline{\mathrm{a}}, \overline{\mathrm{b}}, \overline{\mathrm{c}}$ are coplanar vectors then

$(\overline{\mathrm{a}}\times \overline{\mathrm{b}})\times (\overline{\mathrm{b}}\times \overline{\mathrm{c}})+(\overline{\mathrm{b}}\times \overline{\mathrm{c}})\times (\overline{\mathrm{c}}\times \overline{\mathrm{a}})+(\overline{\mathrm{c}}\times \overline{\mathrm{a}})\times (\overline{\mathrm{a}}\times \overline{\mathrm{b}})=$

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