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sir you can simply put 2 underoot r1r2
@@abhinavsaxena4816 yes that was direct formula but many aspirants wants to know the derivation of formula or actual concept
@sscmathsbyarpit ok sir thank you
![Seungmin "그렇게, 천천히, 우리(As we are)" | [Stray Kids : SKZ-PLAYER]](http://i.ytimg.com/vi/kAzmhLHePqU/mqdefault.jpg)
sir you can simply put 2 underoot r1r2
@@abhinavsaxena4816 yes that was direct formula but many aspirants wants to know the derivation of formula or actual concept
@sscmathsbyarpit ok sir thank you