$\overline{\mathrm{i}}\times \left(\overline{\mathrm{i}}\times \overline{\mathrm{a}}\right)+\overline{\mathrm{j}}\times \left(\overline{\mathrm{j}}\times \overline{\mathrm{a}}\right)+\overline{\mathrm{k}}\times \left(\overline{\mathrm{k}}\times \overline{\mathrm{a}}\right)=$

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