Hide the update button from edit view in wordpress custom post type

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finally I found the answer.

 function hide_edit_book_update(){ ?>
  <style type="text/css">
   .post-php.post-type-book #publishing-action {display:none;}
  </style><?php
}
add_action( 'admin_enqueue_scripts', 'hide_edit_book_update' );

add new post and edit post we can differentiate from post-php and php-new-php css class