Again, ask if your answer makes sense!=> Vin+=(V_in+Vsense)*(R2/(R1+R2))
You know that if R1 = 0 Ω that Vin+ = Vin and that if R2 = 0 Ω that Vin+ = Vsense.
Using your new equation, if R1 = 0 Ω then Vin+ = Vin + Vsense and if R2 = 0 Ω then Vin+ = 0.
So you KNOW that this is wrong and there is NO point going any further. Anything else is pure wasted effort!