Cast to Smart TV without ChromeCast?

A

AC Question

I have an LG K7

I went into the youtube app today and there was a button at the top that said i could cast to my tv. i pressed this button and there was my tv, listed. i pressed my tv and it immediately displayed the video i was watching!

i know with chromecast you can even mirror your screen but i've seen posts about a "cast" button in the quick-options menu for this specific purpose. i have Android 5.1.1 so i assumed the button would be there but it is not!!! any suggestions? i'd really like to be able to just mirror my screen to my tv without any annoying additional purchases.
 

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