How to hide node title for specific content type using template file
Maybe you render article as full page then  $title rendered in page.tpl.php
      
      
      
      
        
      
      
      
      
        

you just need override your content type page template, I mean duplicate page.tpl.php ( if you use bootsrap sub theme go to  boostrap theme boostrap\template\system\page.tpl.php`  file to your subtheme template forlder and rename it to page--article.tpl.php and remove title form it.

I mean remove these lines from it 

  &lt;?php if (!empty($title)): ?&gt;
    &lt;h1 class="page-header"&gt;&lt;?php print $title; ?&gt;&lt;/h1&gt;
  &lt;?php endif; ?&gt;


dont forget clear the cache