Example for use tinymce in wordpress 3.5.1?

Use wp_editor(). There are many configuration options; you have to read the source to get all of them.

Example:

$editor_settings =  array (
    'textarea_rows' => 15,
    'media_buttons' => FALSE,
    'teeny'         => TRUE,
    'tinymce'       => TRUE,
    'dfw'           => FALSE,
);

$content = $get_option( 'your_option_name' );
wp_editor( $content, 'your_editor_id', $editor_settings );