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...A help guide on vector algebra dimensional geometry by op gupta indira award winner q if and b then find the value of i j k bijk sol since so d r s will be proportional e projection is units determine direction cosines line whose ratios are x for unit given xa xx aa ax any three vectors c prove that lhs ab bc ca abacbc ac rhs equation plane which contains intersection planes perpendicular to passing through as hence jk ijk such let xi yj zk xiyjzk zy xz yx...