Page::setTitle() 

\nn\t3::Page()->setTitle($title = ''); 

Change PageTitle ( -tag) Does not work if EXT:advancedtitle is activated!

\nn\t3::Page()->setTitle('YEAH!');
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Also available as ViewHelper:

{nnt3:page.title(title:'Yeah')}
{entry.title->nnt3:page.title()}
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| @return void

Source Code 

public function setTitle ( $title = '' ) {
	$titleProvider = GeneralUtility::makeInstance( PageTitleProvider::class );
	$titleProvider->setTitle( htmlspecialchars(strip_tags($title)) );
}
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