Let a smooth curve be such that the slope of the tangent at any point ( ) on it is directly proportional to . If the curve passes through the point and , then is equal to
- (A)
- (B)4✓ Correct
- (C)1
- (D)
Answer: (B)
Solution
The differential equation is for some constant . This gives , integrating: , so . Using : , so . Using : , giving , so , hence . Thus . At : . Therefore .
JEE Main · 2022 · 25 Jul 2022 · Shift 2 · Single correct option