CI4 libaries function call in VIEW

PHP Code:

<?= view_cell('\App\Libraries\Product::recentPosts', ['4' , '7']) ?>

You have no "recentPosts" function in you libraries. Adjust this line to call the right function.

Also, unless it's to render a block of html to display in your view, you shouldn't call a library directly from your view.

sorry sir , my bad
by mistakenly putted that : have updated properly

PHP Code:

<?= view_cell('\App\Libraries\Product::Check_operation', ['4' , '7']) ?>

 still not getting

don't want to render --  just need to call above method  , then how to do .
as its getting difficult for me, to understand

thanks