After deploying an App Engine application in GCP, you can view it in a web browser using the following methods:

1. Google Cloud Console:
   a. Go to the GCP Console: https://console.cloud.google.com/
   b. Select your project.
   c. Navigate to the App Engine dashboard by clicking the hamburger menu, then click on “App Engine.”
   d. In the “Dashboard” tab, you will see the “Application URL” under the “Application Details” section.
   e. Click the URL or copy it and paste it into your web browser to access your deployed application.
2. CLI Commands (gcloud):
   a. Install and set up the Google Cloud SDK: https://cloud.google.com/sdk/docs/install
   b. Authenticate with your GCP account: gcloud auth login
   c. Set the active project: gcloud config set project PROJECT_ID
   d. Get the App Engine application URL: gcloud app browse
   e. The command will output the application URL. Click the URL or copy it and paste it into your web browser to access your deployed application.
3. Terraform:
   a. After deploying your App Engine application using Terraform, you can access the application using the default URL format: https://PROJECT_ID.REGION_ID.r.appspot.com/
   b. Replace PROJECT_ID and REGION_ID with the appropriate values for your project and region.
   c. Click the URL or copy it and paste it into your web browser to access your deployed application.

Please note that Terraform does not provide a direct way to obtain the application URL. Instead, you can manually construct the URL based on your project and region, as shown above.