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Check if 2 nodes are mirror of each other
- To check if two trees are mirror to each other, we need to compare the following conditions:
- 1. The left child of tree 1 should be equal to the right child of tree 2.
- 2. The right child of tree 1 should be equal to the left child of tree 2.
- 3. If both trees have no children (NULL), they are considered mirror trees.
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