Question

find R1/R2 when r1=R1+R2 and 1/r2=1/R1+1R2

I need perfect answer

Answer 1

R1/R2= R1×1/R2 = (R1+R2)×(1/R1+1/R2)
= R1(1/R1+1/R2)+R2(1/R1+1/R2)
= 1+R1/R2+R2/R1+1

So
R1/R2=1+R1/R2+R2/R1+1
R2/R1+2=0 (R1/R2 gets cancelled from both sides)
R2/R1=-2
R1/R2=-1/2 (Reciprocal both sides)