Question: Prove that ( L 1 L 2 ) R = L 2 R L 1 R for all languages L 1 and L 2 .

Prove that
(L1L2)R=L2RL1R
for all languages L1 and L2.
Prove that (L1L2)R=L2RL1R for all languages L1 and L2.

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