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Azure functions can be deployed using Terraform by following these steps:

1. Create an Azure Function App in the Azure portal. This will be the destination for your Terraform deployment.
2. Install the Terraform Azure provider by running terraform init in your local development environment.
3. Create a new Terraform configuration file (e.g. main.tf) and define the variables you need to deploy your Azure function app. These variables may include the function app name, resource group, storage account, and other configuration settings.
4. In the Terraform configuration file, define the Azure function app resource using the azurerm_function_app resource type.
5. Add any necessary configuration for the function app, such as bindings or application settings, using the appropriate resource types. These may include azurerm_function_app_setting, azurerm_function_app_host_keys, or azurerm_function_app_system_identity.
6. Run terraform plan to preview the changes that will be made to your Azure environment.
7. If the plan looks good, run terraform apply to deploy your Azure function app.

Note that Azure functions can call other Azure services, such as Cosmos DB, Service Bus, or Event Hubs. These services can also be provisioned with Terraform and included in your function app configuration.