Let be the solution of the differential equation , with . Then, the point for the curve is:
- (A)not a critical point
- (B)a point of local minima✓ Correct
- (C)a point of local maxima
- (D)a point of inflection
Answer: (B)
Solution
Rewrite the differential equation:
Dividing by :
This gives
Integrating:
Using :
So
At : (critical point)
At :
Therefore, is a point of local minima.
Dividing by :
This gives
Integrating:
Using :
So
At : (critical point)
At :
Therefore, is a point of local minima.

JEE Main · 2022 · 25 Jun 2022 · Shift 1 · Single correct option