With usual notation, if in a `DeltaABC(b+c)/(11)=(c+a)/(12)=(a+b)/(13
Channel: Doubtnut
Date: 29/12/2019

With usual notation, if in a `DeltaABC(b+c)/(11)=(c+a)/(12)=(a+b)/(13)`, then prove that `(cosA)/(7)=(cosB)/(19)=(cosC)/(25)`