Prove that : `(r_1)/(b c)+(r_2)/(c a)+(r_3)/(a b)=1/r-1/(2R)`
Channel: Doubtnut
Date: 2020-01-28

Prove that : `(r_1)/(b c)+(r_2)/(c a)+(r_3)/(a b)=1/r-1/(2R)`