C# - basic recursive

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    public bool IsSymmetric(TreeNode root) 
        if (root == null) return true;
        return IsEqual(root.left, root.right);
    public bool IsEqual(TreeNode left, TreeNode right)
        if (left == null && right == null) return true;
        if (left == null || right == null) return false;
        if (left.val != right.val) return false;
        return IsEqual(left.left, right.right) && IsEqual(left.right, right.left);

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