For redirecting domain.com to www.domain.com you need to made folllowing changes in your .htaccess file.
For this changes make sure that mod_rewrite module is available on your server.
RewriteEngine on
RewriteCond %{HTTP_HOST} ^domain\.com
RewriteRule ^(.*)$ http://www.domain.com/$1 [R=permanent,L]
Note: please replace domain.com with your domain name.
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