SEO friendly redirect + questions

[Iskib]

I am using forums in the / forums with no landing page.

Now I know a 301 redirect is the best SEO friendly redirect using .htaccess

Redirect 301 /old/old.html http://www.you.com/new.html

I also want to redirect all http://mydomain.com to http://www.mydomain.com

I can do this with the .htaccess file using this code

RewriteEngine On
rewritecond %{http_host} ^yoursite.com 
rewriteRule ^(.*) http://www.yoursite.com/$1 [R=301,L]

The question I have is can I use both like

RewriteEngine On
rewritecond %{http_host} ^yoursite.com 
rewriteRule ^(.*) http://www.yoursite.com/$1 [R=301,L]
Redirect 301 /old/old.html http://www.you.com/forums

Thanks in advance