how to remove index.php from base url by htaccess in magento

first you go to admin/system/configuration/web/seo select yes and save

second  this code insert in rootdirectory/.htaccess file

<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>