I try to install geoserver extension(COG S3,GDAL,etc) but i not showing in geoserver.
copy jar files in this patha C:\Program Files\GeoServer\webapps\geoserver\WEB-INF\lib
What version of GeoServer are you running? What version of the extensions did you install? COG for example is a community plugin so did you build from source or download a nightly build? Where there any failures in the logs? What does the “Server Status” tab “Modules” say - do you see the plugins listed there (perhaps with a warning saying why they cannot work…)
Based on your path you are running on windows, so I am not in a direct position to mirror your setup.