"Sochna Kya Jo Bhi Hoga Dekha Jayega" is a popular Bollywood song. The instrumental version of a song is essentially the version without the lyrics, focusing on the music only.
On Android (Samsung/Pixel/OnePlus):
On iPhone:
If you only have the original song:
There is no official instrumental released just for that one line. However, you can get the background score of that scene or a piano/guitar cover. Here's how: "Sochna Kya Jo Bhi Hoga Dekha Jayega" is