1.
L1L_1 through 2i^k^2\hat{i}-\hat{k} parallel to 3i^j^+2k^3\hat{i}-\hat{j}+2\hat{k}; L2L_2 through 2i^+j^3k^2\hat{i}+\hat{j}-3\hat{k} parallel to i^2j^+k^\hat{i}-2\hat{j}+\hat{k}. Shortest distance between L1L_1 and L2L_2 is